646880795497 has 2 divisors, whose sum is σ = 646880795498. Its totient is φ = 646880795496.

The previous prime is 646880795459. The next prime is 646880795527. The reversal of 646880795497 is 794597088646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530455848976 + 116424946521 = 728324^2 + 341211^2 .

It is a cyclic number.

It is not a de Polignac number, because 646880795497 - 2²³ = 646872406889 is a prime.

It is not a weakly prime, because it can be changed into another prime (646880795437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323440397748 + 323440397749.

It is an arithmetic number, because the mean of its divisors is an integer number (323440397749).

Almost surely, 2^646880795497 is an apocalyptic number.

It is an amenable number.

646880795497 is a deficient number, since it is larger than the sum of its proper divisors (1).

646880795497 is an equidigital number, since it uses as much as digits as its factorization.

646880795497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 731566080, while the sum is 73.

The spelling of 646880795497 in words is "six hundred forty-six billion, eight hundred eighty million, seven hundred ninety-five thousand, four hundred ninety-seven".