18938576664 has 96 divisors (see below), whose sum is σ = 60049211040. Its totient is φ = 5279040000.

The previous prime is 18938576653. The next prime is 18938576669. The reversal of 18938576664 is 46667583981.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938576669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 437587 + ... + 478914.

It is an arithmetic number, because the mean of its divisors is an integer number (625512615).

Almost surely, 2^18938576664 is an apocalyptic number.

18938576664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18938576664 is an abundant number, since it is smaller than the sum of its proper divisors (41110634376).

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

18938576664 is a wasteful number, since it uses less digits than its factorization.

18938576664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916561 (or 916554 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 18938576664 in words is "eighteen billion, nine hundred thirty-eight million, five hundred seventy-six thousand, six hundred sixty-four".