18638535362988 has 12 divisors (see below), whose sum is σ = 43489915847000. Its totient is φ = 6212845120992.

The previous prime is 18638535362983. The next prime is 18638535363001. The reversal of 18638535362988 is 88926353583681.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18638535362983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776605640113 + ... + 776605640136.

Almost surely, 2^{18638535362988} is an apocalyptic number.

It is an amenable number.

18638535362988 is an abundant number, since it is smaller than the sum of its proper divisors (24851380484012).

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

18638535362988 is a wasteful number, since it uses less digits than its factorization.

18638535362988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553211280256 (or 1553211280254 counting only the distinct ones).

The product of its digits is 1791590400, while the sum is 75.

The spelling of 18638535362988 in words is "eighteen trillion, six hundred thirty-eight billion, five hundred thirty-five million, three hundred sixty-two thousand, nine hundred eighty-eight".