680642965 has 4 divisors (see below), whose sum is σ = 816771564. Its totient is φ = 544514368.

The previous prime is 680642959. The next prime is 680642969. The reversal of 680642965 is 569246086.

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 381733444 + 298909521 = 19538^2 + 17289^2 .

It is a cyclic number.

It is not a de Polignac number, because 680642965 - 2¹⁵ = 680610197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680642969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68064292 + ... + 68064301.

It is an arithmetic number, because the mean of its divisors is an integer number (204192891).

Almost surely, 2^680642965 is an apocalyptic number.

It is an amenable number.

680642965 is a deficient number, since it is larger than the sum of its proper divisors (136128599).

680642965 is a wasteful number, since it uses less digits than its factorization.

680642965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136128598.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 680642965 is about 26089.1349990758. The cubic root of 680642965 is about 879.6430047301.

The spelling of 680642965 in words is "six hundred eighty million, six hundred forty-two thousand, nine hundred sixty-five".