656213215544 has 32 divisors (see below), whose sum is σ = 1263727195920. Its totient is φ = 319220326656.

The previous prime is 656213215529. The next prime is 656213215549. The reversal of 656213215544 is 445512312656.

It is a junction number, because it is equal to n+sod(n) for n = 656213215495 and 656213215504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656213215549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6008852 + ... + 6117084.

Almost surely, 2^656213215544 is an apocalyptic number.

It is an amenable number.

656213215544 is a deficient number, since it is larger than the sum of its proper divisors (607513980376).

656213215544 is a wasteful number, since it uses less digits than its factorization.

656213215544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128759 (or 128755 counting only the distinct ones).

The product of its digits is 864000, while the sum is 44.

The spelling of 656213215544 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred fifteen thousand, five hundred forty-four".