18730121157 has 16 divisors (see below), whose sum is σ = 30270903360. Its totient is φ = 11351588400.

The previous prime is 18730121153. The next prime is 18730121171. The reversal of 18730121157 is 75112103781.

18730121157 is a `hidden beast` number, since 187 + 301 + 21 + 157 = 666.

It is not a de Polignac number, because 18730121157 - 2² = 18730121153 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18730121153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31531894 + ... + 31532487.

It is an arithmetic number, because the mean of its divisors is an integer number (1891931460).

Almost surely, 2^18730121157 is an apocalyptic number.

It is an amenable number.

18730121157 is a deficient number, since it is larger than the sum of its proper divisors (11540782203).

18730121157 is a wasteful number, since it uses less digits than its factorization.

18730121157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63064401 (or 63064395 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 36.

The spelling of 18730121157 in words is "eighteen billion, seven hundred thirty million, one hundred twenty-one thousand, one hundred fifty-seven".