18479688331 has 4 divisors (see below), whose sum is σ = 19901202832. Its totient is φ = 17058173832.

The previous prime is 18479688319. The next prime is 18479688343. The reversal of 18479688331 is 13388697481.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18479688319) and next prime (18479688343).

It is a cyclic number.

It is not a de Polignac number, because 18479688331 - 2⁹ = 18479687819 is a prime.

It is a super-2 number, since 2×18479688331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18479688361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710757231 + ... + 710757256.

It is an arithmetic number, because the mean of its divisors is an integer number (4975300708).

Almost surely, 2^18479688331 is an apocalyptic number.

18479688331 is a deficient number, since it is larger than the sum of its proper divisors (1421514501).

18479688331 is a wasteful number, since it uses less digits than its factorization.

18479688331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421514500.

The product of its digits is 6967296, while the sum is 58.

The spelling of 18479688331 in words is "eighteen billion, four hundred seventy-nine million, six hundred eighty-eight thousand, three hundred thirty-one".