680556265 has 4 divisors (see below), whose sum is σ = 816667524. Its totient is φ = 544445008.

The previous prime is 680556251. The next prime is 680556293. The reversal of 680556265 is 562655086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 138039001 + 542517264 = 11749^2 + 23292^2 .

It is a cyclic number.

It is not a de Polignac number, because 680556265 - 2⁹ = 680555753 is a prime.

It is a Duffinian 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, 68055622 + ... + 68055631.

It is an arithmetic number, because the mean of its divisors is an integer number (204166881).

Almost surely, 2^680556265 is an apocalyptic number.

It is an amenable number.

680556265 is a deficient number, since it is larger than the sum of its proper divisors (136111259).

680556265 is a wasteful number, since it uses less digits than its factorization.

680556265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136111258.

The product of its (nonzero) digits is 432000, while the sum is 43.

The square root of 680556265 is about 26087.4733349169. The cubic root of 680556265 is about 879.6056536318.

The spelling of 680556265 in words is "six hundred eighty million, five hundred fifty-six thousand, two hundred sixty-five".