18638733075 has 12 divisors (see below), whose sum is σ = 30816038808. Its totient is φ = 9940657600.

The previous prime is 18638733073. The next prime is 18638733089. The reversal of 18638733075 is 57033783681.

It is not a de Polignac number, because 18638733075 - 2¹ = 18638733073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18638733073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124258146 + ... + 124258295.

It is an arithmetic number, because the mean of its divisors is an integer number (2568003234).

Almost surely, 2^18638733075 is an apocalyptic number.

18638733075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18638733075 is a deficient number, since it is larger than the sum of its proper divisors (12177305733).

18638733075 is a wasteful number, since it uses less digits than its factorization.

18638733075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248516454 (or 248516449 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 51.

The spelling of 18638733075 in words is "eighteen billion, six hundred thirty-eight million, seven hundred thirty-three thousand, seventy-five".