685669025 has 6 divisors (see below), whose sum is σ = 850229622. Its totient is φ = 548535200.

The previous prime is 685668967. The next prime is 685669073. The reversal of 685669025 is 520966586.

It can be written as a sum of positive squares in 3 ways, for example, as 25847056 + 659821969 = 5084^2 + 25687^2 .

It is not a de Polignac number, because 685669025 - 2⁶ = 685668961 is a prime.

It is a Duffinian 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, 13713356 + ... + 13713405.

It is an arithmetic number, because the mean of its divisors is an integer number (141704937).

Almost surely, 2^685669025 is an apocalyptic number.

It is an amenable number.

685669025 is a deficient number, since it is larger than the sum of its proper divisors (164560597).

685669025 is a wasteful number, since it uses less digits than its factorization.

685669025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27426771 (or 27426766 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 685669025 is about 26185.2826030196. The cubic root of 685669025 is about 881.8028745688.

The spelling of 685669025 in words is "six hundred eighty-five million, six hundred sixty-nine thousand, twenty-five".