18402431568 has 40 divisors (see below), whose sum is σ = 47676659808. Its totient is φ = 6116460672.

The previous prime is 18402431549. The next prime is 18402431573. The reversal of 18402431568 is 86513420481.

It is a happy number.

It is a super-2 number, since 2×18402431568² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535771 + ... + 569082.

Almost surely, 2^18402431568 is an apocalyptic number.

It is an amenable number.

18402431568 is an abundant number, since it is smaller than the sum of its proper divisors (29274228240).

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

18402431568 is a wasteful number, since it uses less digits than its factorization.

18402431568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105211 (or 1105205 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 18402431568 in words is "eighteen billion, four hundred two million, four hundred thirty-one thousand, five hundred sixty-eight".