188638012215 has 32 divisors (see below), whose sum is σ = 349937187840. Its totient is φ = 96232723488.

The previous prime is 188638012159. The next prime is 188638012243. The reversal of 188638012215 is 512210836881.

188638012215 is a `hidden beast` number, since 1 + 8 + 8 + 638 + 0 + 1 + 2 + 2 + 1 + 5 = 666.

It is not a de Polignac number, because 188638012215 - 2⁹ = 188638011703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30373387 + ... + 30379596.

It is an arithmetic number, because the mean of its divisors is an integer number (10935537120).

Almost surely, 2^188638012215 is an apocalyptic number.

188638012215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

188638012215 is a deficient number, since it is larger than the sum of its proper divisors (161299175625).

188638012215 is a wasteful number, since it uses less digits than its factorization.

188638012215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60753020 (or 60753014 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 188638012215 in words is "one hundred eighty-eight billion, six hundred thirty-eight million, twelve thousand, two hundred fifteen".