66172642504 has 8 divisors (see below), whose sum is σ = 124073704710. Its totient is φ = 33086321248.

The previous prime is 66172642447. The next prime is 66172642517. The reversal of 66172642504 is 40524627166.

It can be written as a sum of positive squares in only one way, i.e., 58514642404 + 7658000100 = 241898^2 + 87510^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4135790149 + ... + 4135790164.

Almost surely, 2^66172642504 is an apocalyptic number.

It is an amenable number.

66172642504 is a deficient number, since it is larger than the sum of its proper divisors (57901062206).

66172642504 is a wasteful number, since it uses less digits than its factorization.

66172642504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271580319 (or 8271580315 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 66172642504 in words is "sixty-six billion, one hundred seventy-two million, six hundred forty-two thousand, five hundred four".