680879123717 has 8 divisors (see below), whose sum is σ = 758539077240. Its totient is φ = 606831261120.

The previous prime is 680879123713. The next prime is 680879123719. The reversal of 680879123717 is 717321978086.

It is a Cunningham number, because it is equal to 825154²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 100721177956 + 580157945761 = 317366^2 + 761681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 680879123717 - 2² = 680879123713 is a prime.

It is a super-2 number, since 2×680879123717² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680879123713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 903022334 + ... + 903023087.

It is an arithmetic number, because the mean of its divisors is an integer number (94817384655).

Almost surely, 2^680879123717 is an apocalyptic number.

It is an amenable number.

680879123717 is a deficient number, since it is larger than the sum of its proper divisors (77659953523).

680879123717 is a wasteful number, since it uses less digits than its factorization.

680879123717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806045463.

The product of its (nonzero) digits is 7112448, while the sum is 59.

The spelling of 680879123717 in words is "six hundred eighty billion, eight hundred seventy-nine million, one hundred twenty-three thousand, seven hundred seventeen".