855745811631 has 48 divisors (see below), whose sum is σ = 1291484263680. Its totient is φ = 545384378880.

The previous prime is 855745811597. The next prime is 855745811647. The reversal of 855745811631 is 136118547558.

855745811631 is a `hidden beast` number, since 8 + 5 + 57 + 4 + 581 + 1 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 855745811631 - 2⁶ = 855745811567 is a prime.

It is a super-2 number, since 2×855745811631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855745812631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27720801 + ... + 27751653.

It is an arithmetic number, because the mean of its divisors is an integer number (26905922160).

Almost surely, 2^855745811631 is an apocalyptic number.

855745811631 is a deficient number, since it is larger than the sum of its proper divisors (435738452049).

855745811631 is a wasteful number, since it uses less digits than its factorization.

855745811631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32096 (or 32093 counting only the distinct ones).

The product of its digits is 4032000, while the sum is 54.

The spelling of 855745811631 in words is "eight hundred fifty-five billion, seven hundred forty-five million, eight hundred eleven thousand, six hundred thirty-one".