85665533231 has 4 divisors (see below), whose sum is σ = 86290829232. Its totient is φ = 85040237232.

The previous prime is 85665533227. The next prime is 85665533251. The reversal of 85665533231 is 13233556658.

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 85665533231 - 2² = 85665533227 is a prime.

It is a super-2 number, since 2×85665533231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85665533251) 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, 312647795 + ... + 312648068.

It is an arithmetic number, because the mean of its divisors is an integer number (21572707308).

Almost surely, 2^85665533231 is an apocalyptic number.

85665533231 is a deficient number, since it is larger than the sum of its proper divisors (625296001).

85665533231 is a wasteful number, since it uses less digits than its factorization.

85665533231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625296000.

The product of its digits is 1944000, while the sum is 47.

The spelling of 85665533231 in words is "eighty-five billion, six hundred sixty-five million, five hundred thirty-three thousand, two hundred thirty-one".