18391729976 has 8 divisors (see below), whose sum is σ = 34484493720. Its totient is φ = 9195864984.

The previous prime is 18391729957. The next prime is 18391729987. The reversal of 18391729976 is 67992719381.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1149483116 + ... + 1149483131.

It is an arithmetic number, because the mean of its divisors is an integer number (4310561715).

Almost surely, 2^18391729976 is an apocalyptic number.

It is an amenable number.

18391729976 is a deficient number, since it is larger than the sum of its proper divisors (16092763744).

18391729976 is a wasteful number, since it uses less digits than its factorization.

18391729976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298966253 (or 2298966249 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 62.

The spelling of 18391729976 in words is "eighteen billion, three hundred ninety-one million, seven hundred twenty-nine thousand, nine hundred seventy-six".