764636866817 has 2 divisors, whose sum is σ = 764636866818. Its totient is φ = 764636866816.

The previous prime is 764636866801. The next prime is 764636866823. The reversal of 764636866817 is 718668636467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653795147776 + 110841719041 = 808576^2 + 332929^2 .

It is an emirp because it is prime and its reverse (718668636467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 764636866817 - 2⁴ = 764636866801 is a prime.

It is a super-2 number, since 2×764636866817² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (764636866867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382318433408 + 382318433409.

It is an arithmetic number, because the mean of its divisors is an integer number (382318433409).

Almost surely, 2^764636866817 is an apocalyptic number.

It is an amenable number.

764636866817 is a deficient number, since it is larger than the sum of its proper divisors (1).

764636866817 is an equidigital number, since it uses as much as digits as its factorization.

764636866817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 292626432, while the sum is 68.

The spelling of 764636866817 in words is "seven hundred sixty-four billion, six hundred thirty-six million, eight hundred sixty-six thousand, eight hundred seventeen".