85640769231 has 4 divisors (see below), whose sum is σ = 114187692312. Its totient is φ = 57093846152.

The previous prime is 85640769211. The next prime is 85640769241. The reversal of 85640769231 is 13296704658.

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 85640769231 - 2⁷ = 85640769103 is a prime.

It is a super-2 number, since 2×85640769231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85640769211) 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, 14273461536 + ... + 14273461541.

It is an arithmetic number, because the mean of its divisors is an integer number (28546923078).

It is a 1-persistent number, because it is pandigital, but 2⋅85640769231 = 171281538462 is not.

Almost surely, 2^85640769231 is an apocalyptic number.

85640769231 is a deficient number, since it is larger than the sum of its proper divisors (28546923081).

85640769231 is a wasteful number, since it uses less digits than its factorization.

85640769231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28546923080.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 85640769231 in words is "eighty-five billion, six hundred forty million, seven hundred sixty-nine thousand, two hundred thirty-one".