656211505660 has 12 divisors (see below), whose sum is σ = 1378044161928. Its totient is φ = 262484602256.

The previous prime is 656211505601. The next prime is 656211505849. The reversal of 656211505660 is 66505112656.

It is a super-2 number, since 2×656211505660² (a number of 24 digits) contains 22 as substring.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 16405287622 + ... + 16405287661.

It is an arithmetic number, because the mean of its divisors is an integer number (114837013494).

Almost surely, 2^656211505660 is an apocalyptic number.

It is an amenable number.

656211505660 is an abundant number, since it is smaller than the sum of its proper divisors (721832656268).

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

656211505660 is a wasteful number, since it uses less digits than its factorization.

656211505660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32810575292 (or 32810575290 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 656211505660 in words is "six hundred fifty-six billion, two hundred eleven million, five hundred five thousand, six hundred sixty".