656615916 has 48 divisors (see below), whose sum is σ = 1857098880. Its totient is φ = 198974160.

The previous prime is 656615899. The next prime is 656615917. The reversal of 656615916 is 619516656.

656615916 is a `hidden beast` number, since 6 + 56 + 6 + 1 + 591 + 6 = 666.

656615916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×656615916² = 862288922289038112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656615917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275166 + ... + 277541.

It is an arithmetic number, because the mean of its divisors is an integer number (38689560).

Almost surely, 2^656615916 is an apocalyptic number.

656615916 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

656615916 is an abundant number, since it is smaller than the sum of its proper divisors (1200482964).

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

656615916 is a wasteful number, since it uses less digits than its factorization.

656615916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552731 (or 552723 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 656615916 is about 25624.5178686351. The cubic root of 656615916 is about 869.1681466101.

The spelling of 656615916 in words is "six hundred fifty-six million, six hundred fifteen thousand, nine hundred sixteen".