685597925 has 6 divisors (see below), whose sum is σ = 850141458. Its totient is φ = 548478320.

The previous prime is 685597907. The next prime is 685597937. The reversal of 685597925 is 529795586.

It can be written as a sum of positive squares in 3 ways, for example, as 40742689 + 644855236 = 6383^2 + 25394^2 .

It is not a de Polignac number, because 685597925 - 2¹⁶ = 685532389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13711934 + ... + 13711983.

It is an arithmetic number, because the mean of its divisors is an integer number (141690243).

Almost surely, 2^685597925 is an apocalyptic number.

It is an amenable number.

685597925 is a deficient number, since it is larger than the sum of its proper divisors (164543533).

685597925 is a wasteful number, since it uses less digits than its factorization.

685597925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27423927 (or 27423922 counting only the distinct ones).

The product of its digits is 6804000, while the sum is 56.

The square root of 685597925 is about 26183.9249349673. The cubic root of 685597925 is about 881.7723941916.

The spelling of 685597925 in words is "six hundred eighty-five million, five hundred ninety-seven thousand, nine hundred twenty-five".