18917168980 has 12 divisors (see below), whose sum is σ = 39726054900. Its totient is φ = 7566867584.

The previous prime is 18917168971. The next prime is 18917168993. The reversal of 18917168980 is 8986171981.

It can be written as a sum of positive squares in 2 ways, for example, as 5504749636 + 13412419344 = 74194^2 + 115812^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472929205 + ... + 472929244.

It is an arithmetic number, because the mean of its divisors is an integer number (3310504575).

Almost surely, 2^18917168980 is an apocalyptic number.

18917168980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18917168980 is an abundant number, since it is smaller than the sum of its proper divisors (20808885920).

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

18917168980 is a wasteful number, since it uses less digits than its factorization.

18917168980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945858458 (or 945858456 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 58.

The spelling of 18917168980 in words is "eighteen billion, nine hundred seventeen million, one hundred sixty-eight thousand, nine hundred eighty".