18937031568 has 480 divisors, whose sum is σ = 66329504640. Its totient is φ = 4598415360.

The previous prime is 18937031539. The next prime is 18937031573. The reversal of 18937031568 is 86513073981.

It is a super-2 number, since 2×18937031568² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18937031568.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21494488 + ... + 21495368.

It is an arithmetic number, because the mean of its divisors is an integer number (138186468).

Almost surely, 2^18937031568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18937031568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33164752320).

18937031568 is an abundant number, since it is smaller than the sum of its proper divisors (47392473072).

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

18937031568 is a wasteful number, since it uses less digits than its factorization.

18937031568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 18937031568 in words is "eighteen billion, nine hundred thirty-seven million, thirty-one thousand, five hundred sixty-eight".