18465806856331 has 4 divisors (see below), whose sum is σ = 18498146273464. Its totient is φ = 18433467439200.

The previous prime is 18465806856323. The next prime is 18465806856361. The reversal of 18465806856331 is 13365860856481.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18465806856331 - 2³ = 18465806856323 is a prime.

It is a super-2 number, since 2×18465806856331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18465806856361) 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, 16169707710 + ... + 16169708851.

It is an arithmetic number, because the mean of its divisors is an integer number (4624536568366).

Almost surely, 2^{18465806856331} is an apocalyptic number.

18465806856331 is a deficient number, since it is larger than the sum of its proper divisors (32339417133).

18465806856331 is an equidigital number, since it uses as much as digits as its factorization.

18465806856331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32339417132.

The product of its (nonzero) digits is 99532800, while the sum is 64.

The spelling of 18465806856331 in words is "eighteen trillion, four hundred sixty-five billion, eight hundred six million, eight hundred fifty-six thousand, three hundred thirty-one".