18386721676 has 12 divisors (see below), whose sum is σ = 32229257872. Its totient is φ = 9178362288.

The previous prime is 18386721659. The next prime is 18386721677. The reversal of 18386721676 is 67612768381.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18386721677) by changing a digit.

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, 3746880 + ... + 3751783.

Almost surely, 2^18386721676 is an apocalyptic number.

It is an amenable number.

18386721676 is a deficient number, since it is larger than the sum of its proper divisors (13842536196).

18386721676 is a wasteful number, since it uses less digits than its factorization.

18386721676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7499280 (or 7499278 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 55.

The spelling of 18386721676 in words is "eighteen billion, three hundred eighty-six million, seven hundred twenty-one thousand, six hundred seventy-six".