18672391988 has 12 divisors (see below), whose sum is σ = 32678419872. Its totient is φ = 9335700600.

The previous prime is 18672391979. The next prime is 18672392029. The reversal of 18672391988 is 88919327681.

It is a self number, because there is not a number n which added to its sum of digits gives 18672391988.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 31370 + ... + 195777.

It is an arithmetic number, because the mean of its divisors is an integer number (2723201656).

Almost surely, 2^18672391988 is an apocalyptic number.

It is an amenable number.

18672391988 is a deficient number, since it is larger than the sum of its proper divisors (14006027884).

18672391988 is a wasteful number, since it uses less digits than its factorization.

18672391988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247702 (or 247700 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 62.

The spelling of 18672391988 in words is "eighteen billion, six hundred seventy-two million, three hundred ninety-one thousand, nine hundred eighty-eight".