65613431656 has 8 divisors (see below), whose sum is σ = 123025184370. Its totient is φ = 32806715824.

The previous prime is 65613431627. The next prime is 65613431699.

It is a happy number.

65613431656 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 62425022500 + 3188409156 = 249850^2 + 56466^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 4100839471 + ... + 4100839486.

Almost surely, 2^65613431656 is an apocalyptic number.

It is an amenable number.

65613431656 is a deficient number, since it is larger than the sum of its proper divisors (57411752714).

65613431656 is a wasteful number, since it uses less digits than its factorization.

65613431656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8201678963 (or 8201678959 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 46.

The spelling of 65613431656 in words is "sixty-five billion, six hundred thirteen million, four hundred thirty-one thousand, six hundred fifty-six".