8100720016 has 15 divisors (see below), whose sum is σ = 15695842593. Its totient is φ = 4050180000.

The previous prime is 8100720011. The next prime is 8100720041. The reversal of 8100720016 is 6100270018.

The square root of 8100720016 is 90004.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8099280016 + 1440000 = 89996^2 + 1200^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8100720011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 348766 + ... + 371266.

Almost surely, 2^8100720016 is an apocalyptic number.

8100720016 is the 90004-th square number.

It is an amenable number.

8100720016 is a deficient number, since it is larger than the sum of its proper divisors (7595122577).

8100720016 is an frugal number, since it uses more digits than its factorization.

8100720016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45010 (or 22503 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The cubic root of 8100720016 is about 2008.3583549569.

Multiplying 8100720016 by its sum of digits (25), we get a square (202518000400 = 450020²).

The spelling of 8100720016 in words is "eight billion, one hundred million, seven hundred twenty thousand, sixteen".