18437440864 has 48 divisors (see below), whose sum is σ = 36643090176. Its totient is φ = 9131673600.

The previous prime is 18437440843. The next prime is 18437440871. The reversal of 18437440864 is 46804473481.

It is a super-2 number, since 2×18437440864² (a number of 21 digits) contains 22 as substring.

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, 1466734 + ... + 1479250.

It is an arithmetic number, because the mean of its divisors is an integer number (763397712).

Almost surely, 2^18437440864 is an apocalyptic number.

It is an amenable number.

18437440864 is a deficient number, since it is larger than the sum of its proper divisors (18205649312).

18437440864 is a wasteful number, since it uses less digits than its factorization.

18437440864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12959 (or 12951 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 49.

The spelling of 18437440864 in words is "eighteen billion, four hundred thirty-seven million, four hundred forty thousand, eight hundred sixty-four".