18481865792 has 56 divisors (see below), whose sum is σ = 41819434776. Its totient is φ = 8028315648.

The previous prime is 18481865771. The next prime is 18481865807. The reversal of 18481865792 is 29756818481.

It can be written as a sum of positive squares in 4 ways, for example, as 6492491776 + 11989374016 = 80576^2 + 109496^2 .

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, 639203 + ... + 667490.

It is an arithmetic number, because the mean of its divisors is an integer number (746775621).

Almost surely, 2^18481865792 is an apocalyptic number.

It is an amenable number.

18481865792 is an abundant number, since it is smaller than the sum of its proper divisors (23337568984).

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

18481865792 is a wasteful number, since it uses less digits than its factorization.

18481865792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306735 (or 1306725 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 59.

The spelling of 18481865792 in words is "eighteen billion, four hundred eighty-one million, eight hundred sixty-five thousand, seven hundred ninety-two".