85644311181 has 128 divisors (see below), whose sum is σ = 141976074240. Its totient is φ = 45214848000.

The previous prime is 85644311149. The next prime is 85644311209. The reversal of 85644311181 is 18111344658.

It is not a de Polignac number, because 85644311181 - 2⁵ = 85644311149 is a prime.

It is a super-2 number, since 2×85644311181² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85644311381) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 122174131 + ... + 122174831.

It is an arithmetic number, because the mean of its divisors is an integer number (1109188080).

Almost surely, 2^85644311181 is an apocalyptic number.

It is an amenable number.

85644311181 is a deficient number, since it is larger than the sum of its proper divisors (56331763059).

85644311181 is a wasteful number, since it uses less digits than its factorization.

85644311181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987.

The product of its digits is 92160, while the sum is 42.

The spelling of 85644311181 in words is "eighty-five billion, six hundred forty-four million, three hundred eleven thousand, one hundred eighty-one".