656640673056 has 168 divisors, whose sum is σ = 2040270135120. Its totient is φ = 207360072576.

The previous prime is 656640672979. The next prime is 656640673069. The reversal of 656640673056 is 650376046656.

656640673056 is a `hidden beast` number, since 6 + 566 + 4 + 0 + 6 + 73 + 0 + 5 + 6 = 666.

It is a super-2 number, since 2×656640673056² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 656640672993 and 656640673011.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 297510 + ... + 1183973.

It is an arithmetic number, because the mean of its divisors is an integer number (12144465090).

Almost surely, 2^656640673056 is an apocalyptic number.

It is an amenable number.

656640673056 is an abundant number, since it is smaller than the sum of its proper divisors (1383629462064).

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

656640673056 is a wasteful number, since it uses less digits than its factorization.

656640673056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481530 (or 1481507 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 54.

The spelling of 656640673056 in words is "six hundred fifty-six billion, six hundred forty million, six hundred seventy-three thousand, fifty-six".