18505931144 has 16 divisors (see below), whose sum is σ = 36524864400. Its totient is φ = 8765967312.

The previous prime is 18505931131. The next prime is 18505931177. The reversal of 18505931144 is 44113950581.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60874622 + ... + 60874925.

It is an arithmetic number, because the mean of its divisors is an integer number (2282804025).

Almost surely, 2^18505931144 is an apocalyptic number.

It is an amenable number.

18505931144 is a deficient number, since it is larger than the sum of its proper divisors (18018933256).

18505931144 is a wasteful number, since it uses less digits than its factorization.

18505931144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121749572 (or 121749568 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 18505931144 in words is "eighteen billion, five hundred five million, nine hundred thirty-one thousand, one hundred forty-four".