18171872768 has 40 divisors (see below), whose sum is σ = 41495155152. Its totient is φ = 7787943936.

The previous prime is 18171872767. The next prime is 18171872779. The reversal of 18171872768 is 86727817181.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18171872767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2531555 + ... + 2538722.

Almost surely, 2^18171872768 is an apocalyptic number.

It is an amenable number.

18171872768 is an abundant number, since it is smaller than the sum of its proper divisors (23323282384).

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

18171872768 is an frugal number, since it uses more digits than its factorization.

18171872768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5070302 (or 5070286 counting only the distinct ones).

The product of its digits is 2107392, while the sum is 56.

The spelling of 18171872768 in words is "eighteen billion, one hundred seventy-one million, eight hundred seventy-two thousand, seven hundred sixty-eight".