18772822863218 has 4 divisors (see below), whose sum is σ = 28159234294830. Its totient is φ = 9386411431608.

The previous prime is 18772822863173. The next prime is 18772822863247. The reversal of 18772822863218 is 81236822827781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16631087203129 + 2141735660089 = 4078123^2 + 1463467^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4693205715803 + ... + 4693205715806.

Almost surely, 2^{18772822863218} is an apocalyptic number.

18772822863218 is a deficient number, since it is larger than the sum of its proper divisors (9386411431612).

18772822863218 is an equidigital number, since it uses as much as digits as its factorization.

18772822863218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9386411431611.

The product of its digits is 57802752, while the sum is 65.

The spelling of 18772822863218 in words is "eighteen trillion, seven hundred seventy-two billion, eight hundred twenty-two million, eight hundred sixty-three thousand, two hundred eighteen".