18531964664 has 32 divisors (see below), whose sum is σ = 35348400000. Its totient is φ = 9105832032.

The previous prime is 18531964637. The next prime is 18531964667. The reversal of 18531964664 is 46646913581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18531964667) by changing a digit.

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, 2054837 + ... + 2063835.

It is an arithmetic number, because the mean of its divisors is an integer number (1104637500).

Almost surely, 2^18531964664 is an apocalyptic number.

It is an amenable number.

18531964664 is a deficient number, since it is larger than the sum of its proper divisors (16816435336).

18531964664 is a wasteful number, since it uses less digits than its factorization.

18531964664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13427 (or 13423 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 53.

The spelling of 18531964664 in words is "eighteen billion, five hundred thirty-one million, nine hundred sixty-four thousand, six hundred sixty-four".