680761605493 has 2 divisors, whose sum is σ = 680761605494. Its totient is φ = 680761605492.

The previous prime is 680761605413. The next prime is 680761605533. The reversal of 680761605493 is 394506167086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575926174404 + 104835431089 = 758898^2 + 323783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680761605493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680761605413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340380802746 + 340380802747.

It is an arithmetic number, because the mean of its divisors is an integer number (340380802747).

Almost surely, 2^680761605493 is an apocalyptic number.

It is an amenable number.

680761605493 is a deficient number, since it is larger than the sum of its proper divisors (1).

680761605493 is an equidigital number, since it uses as much as digits as its factorization.

680761605493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 680761605493 in words is "six hundred eighty billion, seven hundred sixty-one million, six hundred five thousand, four hundred ninety-three".