65610997261 has 2 divisors, whose sum is σ = 65610997262. Its totient is φ = 65610997260.

The previous prime is 65610997223. The next prime is 65610997297. The reversal of 65610997261 is 16279901656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49503580036 + 16107417225 = 222494^2 + 126915^2 .

It is a cyclic number.

It is not a de Polignac number, because 65610997261 - 2¹⁵ = 65610964493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65610997199 and 65610997208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65610997861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32805498630 + 32805498631.

It is an arithmetic number, because the mean of its divisors is an integer number (32805498631).

Almost surely, 2^65610997261 is an apocalyptic number.

It is an amenable number.

65610997261 is a deficient number, since it is larger than the sum of its proper divisors (1).

65610997261 is an equidigital number, since it uses as much as digits as its factorization.

65610997261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 65610997261 in words is "sixty-five billion, six hundred ten million, nine hundred ninety-seven thousand, two hundred sixty-one".