685231179520 has 36 divisors (see below), whose sum is σ = 1641342812760. Its totient is φ = 274092471296.

The previous prime is 685231179511. The next prime is 685231179539. The reversal of 685231179520 is 25971132586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267667150 + ... + 267669709.

It is an arithmetic number, because the mean of its divisors is an integer number (45592855910).

Almost surely, 2^685231179520 is an apocalyptic number.

It is an amenable number.

685231179520 is an abundant number, since it is smaller than the sum of its proper divisors (956111633240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685231179520 is an equidigital number, since it uses as much as digits as its factorization.

685231179520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535336880 (or 535336866 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 685231179520 in words is "six hundred eighty-five billion, two hundred thirty-one million, one hundred seventy-nine thousand, five hundred twenty".