18817958313 has 80 divisors (see below), whose sum is σ = 35902500480. Its totient is φ = 9537004800.

The previous prime is 18817958309. The next prime is 18817958351. The reversal of 18817958313 is 31385971881.

It is a happy number.

It is not a de Polignac number, because 18817958313 - 2² = 18817958309 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18817958313.

It is not an unprimeable number, because it can be changed into a prime (18817958363) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 218923 + ... + 292511.

It is an arithmetic number, because the mean of its divisors is an integer number (448781256).

Almost surely, 2^18817958313 is an apocalyptic number.

It is an amenable number.

18817958313 is a deficient number, since it is larger than the sum of its proper divisors (17084542167).

18817958313 is a wasteful number, since it uses less digits than its factorization.

18817958313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73660 (or 73651 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The spelling of 18817958313 in words is "eighteen billion, eight hundred seventeen million, nine hundred fifty-eight thousand, three hundred thirteen".