18186668408 has 32 divisors (see below), whose sum is σ = 36114284160. Its totient is φ = 8556441600.

The previous prime is 18186668363. The next prime is 18186668431. The reversal of 18186668408 is 80486668181.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 687833 + ... + 713783.

It is an arithmetic number, because the mean of its divisors is an integer number (1128571380).

Almost surely, 2^18186668408 is an apocalyptic number.

It is an amenable number.

18186668408 is a deficient number, since it is larger than the sum of its proper divisors (17927615752).

18186668408 is a wasteful number, since it uses less digits than its factorization.

18186668408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31127 (or 31123 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 56.

The spelling of 18186668408 in words is "eighteen billion, one hundred eighty-six million, six hundred sixty-eight thousand, four hundred eight".