18634320157720 has 32 divisors (see below), whose sum is σ = 41931874059120. Its totient is φ = 7452900737920.

The previous prime is 18634320157693. The next prime is 18634320157751. The reversal of 18634320157720 is 2775102343681.

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, 25488967 + ... + 26209846.

Almost surely, 2^{18634320157720} is an apocalyptic number.

18634320157720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18634320157720 is an abundant number, since it is smaller than the sum of its proper divisors (23297553901400).

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

18634320157720 is a wasteful number, since it uses less digits than its factorization.

18634320157720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51707835 (or 51707831 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 18634320157720 in words is "eighteen trillion, six hundred thirty-four billion, three hundred twenty million, one hundred fifty-seven thousand, seven hundred twenty".