18811266688944 has 80 divisors (see below), whose sum is σ = 54018812262240. Its totient is φ = 6267692067840.

The previous prime is 18811266688931. The next prime is 18811266688961. The reversal of 18811266688944 is 44988666211881.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

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, 8486277 + ... + 10470884.

It is an arithmetic number, because the mean of its divisors is an integer number (675235153278).

Almost surely, 2^{18811266688944} is an apocalyptic number.

It is an amenable number.

18811266688944 is an abundant number, since it is smaller than the sum of its proper divisors (35207545573296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18811266688944 is a wasteful number, since it uses less digits than its factorization.

18811266688944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18959475 (or 18959463 counting only the distinct ones).

The product of its digits is 254803968, while the sum is 72.

The spelling of 18811266688944 in words is "eighteen trillion, eight hundred eleven billion, two hundred sixty-six million, six hundred eighty-eight thousand, nine hundred forty-four".