656212621656 has 64 divisors (see below), whose sum is σ = 1644042631680. Its totient is φ = 218269676160.

The previous prime is 656212621651. The next prime is 656212621693. The reversal of 656212621656 is 656126212656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656212621651) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 49815951 + ... + 49829121.

It is an arithmetic number, because the mean of its divisors is an integer number (25688166120).

Almost surely, 2^656212621656 is an apocalyptic number.

It is an amenable number.

656212621656 is an abundant number, since it is smaller than the sum of its proper divisors (987830010024).

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

656212621656 is a wasteful number, since it uses less digits than its factorization.

656212621656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17464 (or 17460 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The spelling of 656212621656 in words is "six hundred fifty-six billion, two hundred twelve million, six hundred twenty-one thousand, six hundred fifty-six".