18668795639 has 8 divisors (see below), whose sum is σ = 20595219792. Its totient is φ = 16812423360.

The previous prime is 18668795627. The next prime is 18668795681. The reversal of 18668795639 is 93659786681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18668795639 - 2²⁸ = 18400360183 is a prime.

It is a super-2 number, since 2×18668795639² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18668795609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17512409 + ... + 17513474.

It is an arithmetic number, because the mean of its divisors is an integer number (2574402474).

Almost surely, 2^18668795639 is an apocalyptic number.

18668795639 is a deficient number, since it is larger than the sum of its proper divisors (1926424153).

18668795639 is a wasteful number, since it uses less digits than its factorization.

18668795639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35025937.

The product of its digits is 117573120, while the sum is 68.

The spelling of 18668795639 in words is "eighteen billion, six hundred sixty-eight million, seven hundred ninety-five thousand, six hundred thirty-nine".