18786308821636 has 48 divisors (see below), whose sum is σ = 35470528539264. Its totient is φ = 8672879494656.

The previous prime is 18786308821613. The next prime is 18786308821669. The reversal of 18786308821636 is 63612880368781.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors.

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, 33829231 + ... + 34380073.

It is an arithmetic number, because the mean of its divisors is an integer number (738969344568).

Almost surely, 2^{18786308821636} is an apocalyptic number.

It is an amenable number.

18786308821636 is a deficient number, since it is larger than the sum of its proper divisors (16684219717628).

18786308821636 is a wasteful number, since it uses less digits than its factorization.

18786308821636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560380 (or 560378 counting only the distinct ones).

The product of its (nonzero) digits is 111476736, while the sum is 67.

The spelling of 18786308821636 in words is "eighteen trillion, seven hundred eighty-six billion, three hundred eight million, eight hundred twenty-one thousand, six hundred thirty-six".