18653396639 has 4 divisors (see below), whose sum is σ = 18654387024. Its totient is φ = 18652406256.

The previous prime is 18653396627. The next prime is 18653396669. The reversal of 18653396639 is 93669335681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93669335681 = 59 ⋅1587615859.

It is a cyclic number.

It is not a de Polignac number, because 18653396639 - 2⁸ = 18653396383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18653396669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466382 + ... + 504795.

It is an arithmetic number, because the mean of its divisors is an integer number (4663596756).

Almost surely, 2^18653396639 is an apocalyptic number.

18653396639 is a deficient number, since it is larger than the sum of its proper divisors (990385).

18653396639 is an equidigital number, since it uses as much as digits as its factorization.

18653396639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990384.

The product of its digits is 18895680, while the sum is 59.

The spelling of 18653396639 in words is "eighteen billion, six hundred fifty-three million, three hundred ninety-six thousand, six hundred thirty-nine".