18689608464 has 40 divisors (see below), whose sum is σ = 49072996032. Its totient is φ = 6127739520.

The previous prime is 18689608439. The next prime is 18689608471. The reversal of 18689608464 is 46480698681.

It is a junction number, because it is equal to n+sod(n) for n = 18689608398 and 18689608407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3188604 + ... + 3194459.

Almost surely, 2^18689608464 is an apocalyptic number.

It is an amenable number.

18689608464 is an abundant number, since it is smaller than the sum of its proper divisors (30383387568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18689608464 is a wasteful number, since it uses less digits than its factorization.

18689608464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6383135 (or 6383129 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 60.

The spelling of 18689608464 in words is "eighteen billion, six hundred eighty-nine million, six hundred eight thousand, four hundred sixty-four".