18981618864576 has 56 divisors (see below), whose sum is σ = 50709794139264. Its totient is φ = 6265777094400.

The previous prime is 18981618864547. The next prime is 18981618864589. The reversal of 18981618864576 is 67546881618981.

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, 479895750 + ... + 479935301.

Almost surely, 2^{18981618864576} is an apocalyptic number.

18981618864576 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18981618864576 is an abundant number, since it is smaller than the sum of its proper divisors (31728175274688).

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

18981618864576 is a wasteful number, since it uses less digits than its factorization.

18981618864576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959831169 (or 959831159 counting only the distinct ones).

The product of its digits is 1114767360, while the sum is 78.

The spelling of 18981618864576 in words is "eighteen trillion, nine hundred eighty-one billion, six hundred eighteen million, eight hundred sixty-four thousand, five hundred seventy-six".