18668622158 has 16 divisors (see below), whose sum is σ = 28910394240. Its totient is φ = 9031910400.

The previous prime is 18668622113. The next prime is 18668622187. The reversal of 18668622158 is 85122686681.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525998 + ... + 560366.

It is an arithmetic number, because the mean of its divisors is an integer number (1806899640).

Almost surely, 2^18668622158 is an apocalyptic number.

18668622158 is a deficient number, since it is larger than the sum of its proper divisors (10241772082).

18668622158 is a wasteful number, since it uses less digits than its factorization.

18668622158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43163.

The product of its digits is 2211840, while the sum is 53.

The spelling of 18668622158 in words is "eighteen billion, six hundred sixty-eight million, six hundred twenty-two thousand, one hundred fifty-eight".