18668668535 has 8 divisors (see below), whose sum is σ = 24438984336. Its totient is φ = 13577213440.

The previous prime is 18668668517. The next prime is 18668668631. The reversal of 18668668535 is 53586686681.

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

It is not a de Polignac number, because 18668668535 - 2⁸ = 18668668279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169715114 + ... + 169715223.

It is an arithmetic number, because the mean of its divisors is an integer number (3054873042).

Almost surely, 2^18668668535 is an apocalyptic number.

18668668535 is a deficient number, since it is larger than the sum of its proper divisors (5770315801).

18668668535 is a wasteful number, since it uses less digits than its factorization.

18668668535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339430353.

The product of its digits is 49766400, while the sum is 62.

The spelling of 18668668535 in words is "eighteen billion, six hundred sixty-eight million, six hundred sixty-eight thousand, five hundred thirty-five".