65698256681 has 2 divisors, whose sum is σ = 65698256682. Its totient is φ = 65698256680.

The previous prime is 65698256669. The next prime is 65698256699. The reversal of 65698256681 is 18665289656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65313469225 + 384787456 = 255565^2 + 19616^2 .

It is a cyclic number.

It is not a de Polignac number, because 65698256681 - 2¹⁰ = 65698255657 is a prime.

It is a super-2 number, since 2×65698256681² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65698255681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32849128340 + 32849128341.

It is an arithmetic number, because the mean of its divisors is an integer number (32849128341).

Almost surely, 2^65698256681 is an apocalyptic number.

It is an amenable number.

65698256681 is a deficient number, since it is larger than the sum of its proper divisors (1).

65698256681 is an equidigital number, since it uses as much as digits as its factorization.

65698256681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37324800, while the sum is 62.

The spelling of 65698256681 in words is "sixty-five billion, six hundred ninety-eight million, two hundred fifty-six thousand, six hundred eighty-one".