18166955992 has 16 divisors (see below), whose sum is σ = 34119918000. Its totient is φ = 9068311200.

The previous prime is 18166955981. The next prime is 18166955993. The reversal of 18166955992 is 29955966181.

It is a self number, because there is not a number n which added to its sum of digits gives 18166955992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18166955993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1890759 + ... + 1900342.

It is an arithmetic number, because the mean of its divisors is an integer number (2132494875).

Almost surely, 2^18166955992 is an apocalyptic number.

It is an amenable number.

18166955992 is a deficient number, since it is larger than the sum of its proper divisors (15952962008).

18166955992 is a wasteful number, since it uses less digits than its factorization.

18166955992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3791706 (or 3791702 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 61.

The spelling of 18166955992 in words is "eighteen billion, one hundred sixty-six million, nine hundred fifty-five thousand, nine hundred ninety-two".