18638306657 has 8 divisors (see below), whose sum is σ = 19450497984. Its totient is φ = 17826267888.

The previous prime is 18638306623. The next prime is 18638306681. The reversal of 18638306657 is 75660383681.

It is a happy number.

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 18638306657 - 2¹⁰ = 18638305633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18638306599 and 18638306608.

It is not an unprimeable number, because it can be changed into a prime (18638326657) 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, 261803 + ... + 325295.

It is an arithmetic number, because the mean of its divisors is an integer number (2431312248).

Almost surely, 2^18638306657 is an apocalyptic number.

It is an amenable number.

18638306657 is a deficient number, since it is larger than the sum of its proper divisors (812191327).

18638306657 is a wasteful number, since it uses less digits than its factorization.

18638306657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76279.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 18638306657 in words is "eighteen billion, six hundred thirty-eight million, three hundred six thousand, six hundred fifty-seven".