18699420636 has 72 divisors (see below), whose sum is σ = 51216481680. Its totient is φ = 5718345984.

The previous prime is 18699420587. The next prime is 18699420659. The reversal of 18699420636 is 63602499681.

18699420636 is a `hidden beast` number, since 186 + 9 + 9 + 420 + 6 + 36 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46281 + ... + 198848.

Almost surely, 2^18699420636 is an apocalyptic number.

It is an amenable number.

18699420636 is an abundant number, since it is smaller than the sum of its proper divisors (32517061044).

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

18699420636 is a wasteful number, since it uses less digits than its factorization.

18699420636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245315 (or 245310 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 18699420636 in words is "eighteen billion, six hundred ninety-nine million, four hundred twenty thousand, six hundred thirty-six".