656984818116 has 81 divisors (see below), whose sum is σ = 1825558946029. Its totient is φ = 199070097600.

The previous prime is 656984818093. The next prime is 656984818183. The reversal of 656984818116 is 611818489656.

The square root of 656984818116 is 810546.

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

656984818116 is a `hidden beast` number, since 6 + 5 + 69 + 8 + 481 + 81 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 574179000516 + 82805817600 = 757746^2 + 287760^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 53489896 + ... + 53502176.

Almost surely, 2^656984818116 is an apocalyptic number.

656984818116 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

656984818116 is the 810546-th square number.

It is an amenable number.

656984818116 is an abundant number, since it is smaller than the sum of its proper divisors (1168574127913).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656984818116 is a wasteful number, since it uses less digits than its factorization.

656984818116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24594 (or 12297 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 63.

The spelling of 656984818116 in words is "six hundred fifty-six billion, nine hundred eighty-four million, eight hundred eighteen thousand, one hundred sixteen".