97769256817 has 2 divisors, whose sum is σ = 97769256818. Its totient is φ = 97769256816.

The previous prime is 97769256811. The next prime is 97769256857. The reversal of 97769256817 is 71865296779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95317917696 + 2451339121 = 308736^2 + 49511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97769256817 is a prime.

It is not a weakly prime, because it can be changed into another prime (97769256811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48884628408 + 48884628409.

It is an arithmetic number, because the mean of its divisors is an integer number (48884628409).

Almost surely, 2^97769256817 is an apocalyptic number.

It is an amenable number.

97769256817 is a deficient number, since it is larger than the sum of its proper divisors (1).

97769256817 is an equidigital number, since it uses as much as digits as its factorization.

97769256817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80015040, while the sum is 67.

The spelling of 97769256817 in words is "ninety-seven billion, seven hundred sixty-nine million, two hundred fifty-six thousand, eight hundred seventeen".