18856921366 has 32 divisors (see below), whose sum is σ = 29416697856. Its totient is φ = 9056124000.

The previous prime is 18856921283. The next prime is 18856921481. The reversal of 18856921366 is 66312965881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7079751 + ... + 7082413.

It is an arithmetic number, because the mean of its divisors is an integer number (919271808).

Almost surely, 2^18856921366 is an apocalyptic number.

18856921366 is a deficient number, since it is larger than the sum of its proper divisors (10559776490).

18856921366 is a wasteful number, since it uses less digits than its factorization.

18856921366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508.

The product of its digits is 3732480, while the sum is 55.

The spelling of 18856921366 in words is "eighteen billion, eight hundred fifty-six million, nine hundred twenty-one thousand, three hundred sixty-six".