85687771631 has 16 divisors (see below), whose sum is σ = 107310594048. Its totient is φ = 66470263200.

The previous prime is 85687771597. The next prime is 85687771681. The reversal of 85687771631 is 13617778658.

It is a happy number.

It is not a de Polignac number, because 85687771631 - 2¹⁰ = 85687770607 is a prime.

It is a super-2 number, since 2×85687771631² (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 (85687771681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2477960 + ... + 2512301.

It is an arithmetic number, because the mean of its divisors is an integer number (6706912128).

Almost surely, 2^85687771631 is an apocalyptic number.

85687771631 is a deficient number, since it is larger than the sum of its proper divisors (21622822417).

85687771631 is a wasteful number, since it uses less digits than its factorization.

85687771631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4990502.

The product of its digits is 11854080, while the sum is 59.

The spelling of 85687771631 in words is "eighty-five billion, six hundred eighty-seven million, seven hundred seventy-one thousand, six hundred thirty-one".