18387023656 has 16 divisors (see below), whose sum is σ = 34484721300. Its totient is φ = 9191097984.

The previous prime is 18387023647. The next prime is 18387023717. The reversal of 18387023656 is 65632078381.

It can be written as a sum of positive squares in 2 ways, for example, as 15310102756 + 3076920900 = 123734^2 + 55470^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269151 + ... + 330478.

Almost surely, 2^18387023656 is an apocalyptic number.

It is an amenable number.

18387023656 is a deficient number, since it is larger than the sum of its proper divisors (16097697644).

18387023656 is a wasteful number, since it uses less digits than its factorization.

18387023656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603468 (or 603464 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 18387023656 in words is "eighteen billion, three hundred eighty-seven million, twenty-three thousand, six hundred fifty-six".