685984186031 has 16 divisors (see below), whose sum is σ = 735392286720. Its totient is φ = 637630965120.

The previous prime is 685984186009. The next prime is 685984186037. The reversal of 685984186031 is 130681489586.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 685984186031 - 2⁶ = 685984185967 is a prime.

It is a super-2 number, since 2×685984186031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685984186037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308621 + ... + 1211286.

It is an arithmetic number, because the mean of its divisors is an integer number (45962017920).

Almost surely, 2^685984186031 is an apocalyptic number.

685984186031 is a deficient number, since it is larger than the sum of its proper divisors (49408100689).

685984186031 is a wasteful number, since it uses less digits than its factorization.

685984186031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520254.

The product of its (nonzero) digits is 9953280, while the sum is 59.

The spelling of 685984186031 in words is "six hundred eighty-five billion, nine hundred eighty-four million, one hundred eighty-six thousand, thirty-one".