18685535188720 has 40 divisors (see below), whose sum is σ = 44618027950944. Its totient is φ = 7272208288512.

The previous prime is 18685535188681. The next prime is 18685535188787. The reversal of 18685535188720 is 2788153558681.

It is a tau number, because it is divible by the number of its divisors (40).

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, 3156337444 + ... + 3156343363.

Almost surely, 2^{18685535188720} is an apocalyptic number.

18685535188720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18685535188720 is an abundant number, since it is smaller than the sum of its proper divisors (25932492762224).

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

18685535188720 is a wasteful number, since it uses less digits than its factorization.

18685535188720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6312680857 (or 6312680851 counting only the distinct ones).

The product of its (nonzero) digits is 129024000, while the sum is 67.

The spelling of 18685535188720 in words is "eighteen trillion, six hundred eighty-five billion, five hundred thirty-five million, one hundred eighty-eight thousand, seven hundred twenty".