18712843664 has 10 divisors (see below), whose sum is σ = 36256134630. Its totient is φ = 9356421824.

The previous prime is 18712843649. The next prime is 18712843727. The reversal of 18712843664 is 46634821781.

It can be written as a sum of positive squares in only one way, i.e., 18670489600 + 42354064 = 136640^2 + 6508^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 584776349 + ... + 584776380.

It is an arithmetic number, because the mean of its divisors is an integer number (3625613463).

Almost surely, 2^18712843664 is an apocalyptic number.

It is an amenable number.

18712843664 is a deficient number, since it is larger than the sum of its proper divisors (17543290966).

18712843664 is a wasteful number, since it uses less digits than its factorization.

18712843664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169552737 (or 1169552731 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 50.

The spelling of 18712843664 in words is "eighteen billion, seven hundred twelve million, eight hundred forty-three thousand, six hundred sixty-four".