18450646836 has 72 divisors (see below), whose sum is σ = 45297149184. Its totient is φ = 5839192320.

The previous prime is 18450646817. The next prime is 18450646843. The reversal of 18450646836 is 63864605481.

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, 1036120 + ... + 1053776.

It is an arithmetic number, because the mean of its divisors is an integer number (629127072).

Almost surely, 2^18450646836 is an apocalyptic number.

It is an amenable number.

18450646836 is an abundant number, since it is smaller than the sum of its proper divisors (26846502348).

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

18450646836 is a wasteful number, since it uses less digits than its factorization.

18450646836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17801 (or 17746 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 51.

The spelling of 18450646836 in words is "eighteen billion, four hundred fifty million, six hundred forty-six thousand, eight hundred thirty-six".