636760256677 has 2 divisors, whose sum is σ = 636760256678. Its totient is φ = 636760256676.

The previous prime is 636760256579. The next prime is 636760256681. The reversal of 636760256677 is 776652067636.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615987952801 + 20772303876 = 784849^2 + 144126^2 .

It is a cyclic number.

It is not a de Polignac number, because 636760256677 - 2¹⁵ = 636760223909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636760250677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318380128338 + 318380128339.

It is an arithmetic number, because the mean of its divisors is an integer number (318380128339).

Almost surely, 2^636760256677 is an apocalyptic number.

It is an amenable number.

636760256677 is a deficient number, since it is larger than the sum of its proper divisors (1).

636760256677 is an equidigital number, since it uses as much as digits as its factorization.

636760256677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80015040, while the sum is 61.

The spelling of 636760256677 in words is "six hundred thirty-six billion, seven hundred sixty million, two hundred fifty-six thousand, six hundred seventy-seven".