636536057197 has 2 divisors, whose sum is σ = 636536057198. Its totient is φ = 636536057196.

The previous prime is 636536057161. The next prime is 636536057239. The reversal of 636536057197 is 791750635636.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636366771076 + 169286121 = 797726^2 + 13011^2 .

It is a cyclic number.

It is not a de Polignac number, because 636536057197 - 2¹¹ = 636536055149 is a prime.

It is a super-2 number, since 2×636536057197² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636536057147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318268028598 + 318268028599.

It is an arithmetic number, because the mean of its divisors is an integer number (318268028599).

Almost surely, 2^636536057197 is an apocalyptic number.

It is an amenable number.

636536057197 is a deficient number, since it is larger than the sum of its proper divisors (1).

636536057197 is an equidigital number, since it uses as much as digits as its factorization.

636536057197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21432600, while the sum is 58.

The spelling of 636536057197 in words is "six hundred thirty-six billion, five hundred thirty-six million, fifty-seven thousand, one hundred ninety-seven".