18695639824 has 15 divisors (see below), whose sum is σ = 36223861863. Its totient is φ = 9347546448.

The previous prime is 18695639819. The next prime is 18695639843. The reversal of 18695639824 is 42893659681.

The square root of 18695639824 is 136732.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 529837 + ... + 564019.

Almost surely, 2^18695639824 is an apocalyptic number.

18695639824 is the 136732-nd square number.

It is an amenable number.

18695639824 is a deficient number, since it is larger than the sum of its proper divisors (17528222039).

18695639824 is an frugal number, since it uses more digits than its factorization.

18695639824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68374 (or 34185 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 61.

The spelling of 18695639824 in words is "eighteen billion, six hundred ninety-five million, six hundred thirty-nine thousand, eight hundred twenty-four".