18630639089 has 4 divisors (see below), whose sum is σ = 18772857840. Its totient is φ = 18488420340.

The previous prime is 18630639059. The next prime is 18630639091. The reversal of 18630639089 is 98093603681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18630639089 - 2⁸ = 18630638833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18630639089.

It is not an unprimeable number, because it can be changed into a prime (18630639019) 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, 71109179 + ... + 71109440.

It is an arithmetic number, because the mean of its divisors is an integer number (4693214460).

Almost surely, 2^18630639089 is an apocalyptic number.

It is an amenable number.

18630639089 is a deficient number, since it is larger than the sum of its proper divisors (142218751).

18630639089 is a wasteful number, since it uses less digits than its factorization.

18630639089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142218750.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 18630639089 in words is "eighteen billion, six hundred thirty million, six hundred thirty-nine thousand, eighty-nine".