18863515004520 has 64 divisors (see below), whose sum is σ = 56596130136000. Its totient is φ = 5029774212608.

The previous prime is 18863515004519. The next prime is 18863515004539. The reversal of 18863515004520 is 2540051536881.

It is a self number, because there is not a number n which added to its sum of digits gives 18863515004520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6535365 + ... + 8968724.

It is an arithmetic number, because the mean of its divisors is an integer number (884314533375).

Almost surely, 2^{18863515004520} is an apocalyptic number.

18863515004520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18863515004520 is an abundant number, since it is smaller than the sum of its proper divisors (37732615131480).

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

18863515004520 is a wasteful number, since it uses less digits than its factorization.

18863515004520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15514242 (or 15514238 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 48.

The spelling of 18863515004520 in words is "eighteen trillion, eight hundred sixty-three billion, five hundred fifteen million, four thousand, five hundred twenty".