656620976616 has 32 divisors (see below), whose sum is σ = 1790784482400. Its totient is φ = 198976053440.

The previous prime is 656620976591. The next prime is 656620976633. The reversal of 656620976616 is 616679026656.

It is a happy number.

656620976616 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 2×656620976616² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 656620976616.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1243600071 + ... + 1243600598.

It is an arithmetic number, because the mean of its divisors is an integer number (55962015075).

Almost surely, 2^656620976616 is an apocalyptic number.

656620976616 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

656620976616 is an abundant number, since it is smaller than the sum of its proper divisors (1134163505784).

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

656620976616 is a wasteful number, since it uses less digits than its factorization.

656620976616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487200689 (or 2487200685 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 60.

The spelling of 656620976616 in words is "six hundred fifty-six billion, six hundred twenty million, nine hundred seventy-six thousand, six hundred sixteen".