85163778231 has 16 divisors (see below), whose sum is σ = 130134873600. Its totient is φ = 48529454688.

The previous prime is 85163778229. The next prime is 85163778239. The reversal of 85163778231 is 13287736158.

It is not a de Polignac number, because 85163778231 - 2¹ = 85163778229 is a prime.

It is a super-2 number, since 2×85163778231² (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 (85163778239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5640676 + ... + 5655753.

It is an arithmetic number, because the mean of its divisors is an integer number (8133429600).

Almost surely, 2^85163778231 is an apocalyptic number.

85163778231 is a deficient number, since it is larger than the sum of its proper divisors (44971095369).

85163778231 is a wasteful number, since it uses less digits than its factorization.

85163778231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11296798.

The product of its digits is 1693440, while the sum is 51.

The spelling of 85163778231 in words is "eighty-five billion, one hundred sixty-three million, seven hundred seventy-eight thousand, two hundred thirty-one".