18863536608 has 120 divisors (see below), whose sum is σ = 63402503472. Its totient is φ = 5389576704.

The previous prime is 18863536597. The next prime is 18863536639. The reversal of 18863536608 is 80663536881.

It is a super-2 number, since 2×18863536608² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 501685 + ... + 537972.

Almost surely, 2^18863536608 is an apocalyptic number.

18863536608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18863536608 is an abundant number, since it is smaller than the sum of its proper divisors (44538966864).

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

18863536608 is a wasteful number, since it uses less digits than its factorization.

18863536608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039686 (or 1039669 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 18863536608 in words is "eighteen billion, eight hundred sixty-three million, five hundred thirty-six thousand, six hundred eight".