636016857257 has 2 divisors, whose sum is σ = 636016857258. Its totient is φ = 636016857256.

The previous prime is 636016857241. The next prime is 636016857293. The reversal of 636016857257 is 752758610636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578955113881 + 57061743376 = 760891^2 + 238876^2 .

It is a cyclic number.

It is not a de Polignac number, because 636016857257 - 2⁴ = 636016857241 is a prime.

It is a super-2 number, since 2×636016857257² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (636016857557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318008428628 + 318008428629.

It is an arithmetic number, because the mean of its divisors is an integer number (318008428629).

Almost surely, 2^636016857257 is an apocalyptic number.

It is an amenable number.

636016857257 is a deficient number, since it is larger than the sum of its proper divisors (1).

636016857257 is an equidigital number, since it uses as much as digits as its factorization.

636016857257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12700800, while the sum is 56.

The spelling of 636016857257 in words is "six hundred thirty-six billion, sixteen million, eight hundred fifty-seven thousand, two hundred fifty-seven".