685871652531 has 64 divisors (see below), whose sum is σ = 1044323280000. Its totient is φ = 397324677120.

The previous prime is 685871652509. The next prime is 685871652533. The reversal of 685871652531 is 135256178586.

It is not a de Polignac number, because 685871652531 - 2¹¹ = 685871650483 is a prime.

It is a super-2 number, since 2×685871652531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (685871652533) 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 63 ways as a sum of consecutive naturals, for example, 90373285 + ... + 90380873.

It is an arithmetic number, because the mean of its divisors is an integer number (16317551250).

Almost surely, 2^685871652531 is an apocalyptic number.

685871652531 is a deficient number, since it is larger than the sum of its proper divisors (358451627469).

685871652531 is a wasteful number, since it uses less digits than its factorization.

685871652531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9624.

The product of its digits is 12096000, while the sum is 57.

The spelling of 685871652531 in words is "six hundred eighty-five billion, eight hundred seventy-one million, six hundred fifty-two thousand, five hundred thirty-one".