680941105215109 has 2 divisors, whose sum is σ = 680941105215110. Its totient is φ = 680941105215108.

The previous prime is 680941105215047. The next prime is 680941105215143. The reversal of 680941105215109 is 901512501149086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415510309764900 + 265430795450209 = 20384070^2 + 16292047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680941105215109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680941105215199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340470552607554 + 340470552607555.

It is an arithmetic number, because the mean of its divisors is an integer number (340470552607555).

Almost surely, 2^{680941105215109} is an apocalyptic number.

It is an amenable number.

680941105215109 is a deficient number, since it is larger than the sum of its proper divisors (1).

680941105215109 is an equidigital number, since it uses as much as digits as its factorization.

680941105215109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 52.

The spelling of 680941105215109 in words is "six hundred eighty trillion, nine hundred forty-one billion, one hundred five million, two hundred fifteen thousand, one hundred nine".