656445056212 has 24 divisors (see below), whose sum is σ = 1287083921760. Its totient is φ = 290319680160.

The previous prime is 656445056191. The next prime is 656445056221. The reversal of 656445056212 is 212650544656.

It is a super-2 number, since 2×656445056212² (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 7 ways as a sum of consecutive naturals, for example, 201609262 + ... + 201612517.

It is an arithmetic number, because the mean of its divisors is an integer number (53628496740).

Almost surely, 2^656445056212 is an apocalyptic number.

It is an amenable number.

656445056212 is a deficient number, since it is larger than the sum of its proper divisors (630638865548).

656445056212 is a wasteful number, since it uses less digits than its factorization.

656445056212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403221831 (or 403221829 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 656445056212 in words is "six hundred fifty-six billion, four hundred forty-five million, fifty-six thousand, two hundred twelve".