18971226608 has 10 divisors (see below), whose sum is σ = 36756751584. Its totient is φ = 9485613296.

The previous prime is 18971226601. The next prime is 18971226613. The reversal of 18971226608 is 80662217981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18971226601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 592850816 + ... + 592850847.

Almost surely, 2^18971226608 is an apocalyptic number.

It is an amenable number.

18971226608 is a deficient number, since it is larger than the sum of its proper divisors (17785524976).

18971226608 is a wasteful number, since it uses less digits than its factorization.

18971226608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185701671 (or 1185701665 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 18971226608 in words is "eighteen billion, nine hundred seventy-one million, two hundred twenty-six thousand, six hundred eight".