680415721109 has 2 divisors, whose sum is σ = 680415721110. Its totient is φ = 680415721108.

The previous prime is 680415721087. The next prime is 680415721123. The reversal of 680415721109 is 901127514086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 678353198884 + 2062522225 = 823622^2 + 45415^2 .

It is a cyclic number.

It is not a de Polignac number, because 680415721109 - 2¹⁶ = 680415655573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680415721109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680415723109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340207860554 + 340207860555.

It is an arithmetic number, because the mean of its divisors is an integer number (340207860555).

Almost surely, 2^680415721109 is an apocalyptic number.

It is an amenable number.

680415721109 is a deficient number, since it is larger than the sum of its proper divisors (1).

680415721109 is an equidigital number, since it uses as much as digits as its factorization.

680415721109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 680415721109 in words is "six hundred eighty billion, four hundred fifteen million, seven hundred twenty-one thousand, one hundred nine".