85640164431 has 4 divisors (see below), whose sum is σ = 114186885912. Its totient is φ = 57093442952.

The previous prime is 85640164409. The next prime is 85640164439. The reversal of 85640164431 is 13446104658.

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 85640164431 - 2²¹ = 85638067279 is a prime.

It is a super-2 number, since 2×85640164431² (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 (85640164439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14273360736 + ... + 14273360741.

It is an arithmetic number, because the mean of its divisors is an integer number (28546721478).

Almost surely, 2^85640164431 is an apocalyptic number.

85640164431 is a deficient number, since it is larger than the sum of its proper divisors (28546721481).

85640164431 is a wasteful number, since it uses less digits than its factorization.

85640164431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28546721480.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 85640164431 in words is "eighty-five billion, six hundred forty million, one hundred sixty-four thousand, four hundred thirty-one".