18450031686 has 16 divisors (see below), whose sum is σ = 37113360624. Its totient is φ = 6114461024.

The previous prime is 18450031679. The next prime is 18450031697. The reversal of 18450031686 is 68613005481.

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, 8886261 + ... + 8888336.

It is an arithmetic number, because the mean of its divisors is an integer number (2319585039).

Almost surely, 2^18450031686 is an apocalyptic number.

18450031686 is an abundant number, since it is smaller than the sum of its proper divisors (18663328938).

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

18450031686 is a wasteful number, since it uses less digits than its factorization.

18450031686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17774775.

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 18450031686 in words is "eighteen billion, four hundred fifty million, thirty-one thousand, six hundred eighty-six".