18839188657 has 12 divisors (see below), whose sum is σ = 20226185140. Its totient is φ = 17533045728.

The previous prime is 18839188651. The next prime is 18839188661. The reversal of 18839188657 is 75688193881.

It can be written as a sum of positive squares in 2 ways, for example, as 17024769441 + 1814419216 = 130479^2 + 42596^2 .

It is not a de Polignac number, because 18839188657 - 2³ = 18839188649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18839188651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 461682 + ... + 500827.

Almost surely, 2^18839188657 is an apocalyptic number.

It is an amenable number.

18839188657 is a deficient number, since it is larger than the sum of its proper divisors (1386996483).

18839188657 is an equidigital number, since it uses as much as digits as its factorization.

18839188657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962592 (or 962569 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 64.

The spelling of 18839188657 in words is "eighteen billion, eight hundred thirty-nine million, one hundred eighty-eight thousand, six hundred fifty-seven".