680207995777 has 2 divisors, whose sum is σ = 680207995778. Its totient is φ = 680207995776.

The previous prime is 680207995739. The next prime is 680207995853. The reversal of 680207995777 is 777599702086.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651767197041 + 28440798736 = 807321^2 + 168644^2 .

It is a cyclic number.

It is not a de Polignac number, because 680207995777 - 2¹⁵ = 680207963009 is a prime.

It is not a weakly prime, because it can be changed into another prime (680207995477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340103997888 + 340103997889.

It is an arithmetic number, because the mean of its divisors is an integer number (340103997889).

Almost surely, 2^680207995777 is an apocalyptic number.

It is an amenable number.

680207995777 is a deficient number, since it is larger than the sum of its proper divisors (1).

680207995777 is an equidigital number, since it uses as much as digits as its factorization.

680207995777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93350880, while the sum is 67.

The spelling of 680207995777 in words is "six hundred eighty billion, two hundred seven million, nine hundred ninety-five thousand, seven hundred seventy-seven".