85641723871 has 32 divisors (see below), whose sum is σ = 101308838400. Its totient is φ = 71511982080.

The previous prime is 85641723857. The next prime is 85641723877. The reversal of 85641723871 is 17832714658.

It is not a de Polignac number, because 85641723871 - 2⁷ = 85641723743 is a prime.

It is a super-2 number, since 2×85641723871² (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 (85641723877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11325990 + ... + 11333548.

It is an arithmetic number, because the mean of its divisors is an integer number (3165901200).

Almost surely, 2^85641723871 is an apocalyptic number.

85641723871 is a deficient number, since it is larger than the sum of its proper divisors (15667114529).

85641723871 is a wasteful number, since it uses less digits than its factorization.

85641723871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9039.

The product of its digits is 2257920, while the sum is 52.

The spelling of 85641723871 in words is "eighty-five billion, six hundred forty-one million, seven hundred twenty-three thousand, eight hundred seventy-one".