It's about 20,000,000,000,000 times as heavy as a Mouse
In other words, 400,000,000 tonnes is 19,000,000,000,000 times the weight of a Mouse, and the weight of a Mouse is 0.000000000000053 times that amount.(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 0.0000210 tonnes. While most mice typically live two to three years, the Methuselah Mouse Prize — an award administered by a non-profit organization which advances aging-related research — was once awarded to a team of scientists whose research resulted in a mouse living just under five years.
It's about 25,000,000,000,000 times as heavy as a Compact disc
In other words, 400,000,000 tonnes is 27,000,000,000,000 times the weight of a Compact disc, and the weight of a Compact disc is 0.000000000000037 times that amount.(a.k.a. CD)
A compact disc typically weighs 0.0000150 tonnes. Data is stored on CDs by encoding into the track a series of tiny pits — each between 3.5 and 850 µm (0.00014 and 0.033 in) in length.
It's about 35,000,000,000,000 times as heavy as a Battery (AAA)
In other words, 400,000,000 tonnes is 33,000,000,000,000 times the weight of a Battery (AAA), and the weight of a Battery (AAA) is 0.000000000000030 times that amount.(Alkaline)
An "AAA" size battery weighs 0.0000120 tonnes. Batteries are named by the American National Standards Institute (ANSI) Committee C18 and AAA batteries were given their name because they were smaller than the "AA" and "A" size batteries which were invented first.
It's about 55,000,000,000,000 times as heavy as an Eye (Human)
In other words, 400,000,000 tonnes is 56,000,000,000,000 times the weight of an Eye (Human), and the weight of an Eye (Human) is 0.000000000000018 times that amount.(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 0.00000710 tonnes. The pupil of the eye varies depending on the amount of light it is exposed to, but typically measures about 4 mm across.
It's about 70,000,000,000,000 times as heavy as a Quarter
In other words, 400,000,000 tonnes is 70,550,000,000,000 times the weight of a Quarter, and the weight of a Quarter is 0.00000000000001417 times that amount.(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. America the Beautiful quarter, a.k.a. two bits)
The America the Beautiful series quarters, which began to enter circulation in 2017, weigh 0.000005670 tonnes each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.
It's about 80,000,000,000,000 times as heavy as a sheet of Paper
In other words, 400,000,000 tonnes is 80,000,000,000,000 times the weight of a sheet of Paper, and the weight of a sheet of Paper is 0.000000000000013 times that amount.(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
The weight of a ream (500 sheets) of 0.0091 tonnes, 8.5 inch x 11 inch paper is 0.002 tonnes, each sheet weighing 0.00000500 tonnes. Paper of this size has a thickness of 0.004 caliper (0.1 mm).
It's about 100,000,000,000,000 times as heavy as a Die (Dice)
In other words, 400,000,000 tonnes is 98,000,000,000,000 times the weight of a Die (Dice), and the weight of a Die (Dice) is 0.0000000000000100 times that amount.(for six-sided, 16 mm, rounded cube)
A die, of the size most commonly used in board games and casinos, typically weight 0.00000410 tonnes. The use of dice and dice-like tools predates written history, with the oldest known examples belonging to a 5,000-year old backgammon set uncovered during an archaeological dig in modern-day Iran.