681209486897 has 2 divisors, whose sum is σ = 681209486898. Its totient is φ = 681209486896.

The previous prime is 681209486851. The next prime is 681209486939. The reversal of 681209486897 is 798684902186.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588252184576 + 92957302321 = 766976^2 + 304889^2 .

It is a cyclic number.

It is not a de Polignac number, because 681209486897 - 2⁶ = 681209486833 is a prime.

It is not a weakly prime, because it can be changed into another prime (681209486597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340604743448 + 340604743449.

It is an arithmetic number, because the mean of its divisors is an integer number (340604743449).

Almost surely, 2^681209486897 is an apocalyptic number.

It is an amenable number.

681209486897 is a deficient number, since it is larger than the sum of its proper divisors (1).

681209486897 is an equidigital number, since it uses as much as digits as its factorization.

681209486897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83607552, while the sum is 68.

The spelling of 681209486897 in words is "six hundred eighty-one billion, two hundred nine million, four hundred eighty-six thousand, eight hundred ninety-seven".