18171977313 has 16 divisors (see below), whose sum is σ = 27692888960. Its totient is φ = 10383140736.

The previous prime is 18171977293. The next prime is 18171977323. The reversal of 18171977313 is 31377917181.

It is not a de Polignac number, because 18171977313 - 2²² = 18167783009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18171977323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304803 + ... + 359511.

It is an arithmetic number, because the mean of its divisors is an integer number (1730805560).

Almost surely, 2^18171977313 is an apocalyptic number.

It is an amenable number.

18171977313 is a deficient number, since it is larger than the sum of its proper divisors (9520911647).

18171977313 is a wasteful number, since it uses less digits than its factorization.

18171977313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70536.

The product of its digits is 222264, while the sum is 48.

The spelling of 18171977313 in words is "eighteen billion, one hundred seventy-one million, nine hundred seventy-seven thousand, three hundred thirteen".