636536056381 has 2 divisors, whose sum is σ = 636536056382. Its totient is φ = 636536056380.

The previous prime is 636536056333. The next prime is 636536056391. The reversal of 636536056381 is 183650635636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599068260025 + 37467796356 = 773995^2 + 193566^2 .

It is a cyclic number.

It is not a de Polignac number, because 636536056381 - 2¹¹ = 636536054333 is a prime.

It is a super-3 number, since 3×636536056381³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636536056391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318268028190 + 318268028191.

It is an arithmetic number, because the mean of its divisors is an integer number (318268028191).

Almost surely, 2^636536056381 is an apocalyptic number.

It is an amenable number.

636536056381 is a deficient number, since it is larger than the sum of its proper divisors (1).

636536056381 is an equidigital number, since it uses as much as digits as its factorization.

636536056381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 52.

The spelling of 636536056381 in words is "six hundred thirty-six billion, five hundred thirty-six million, fifty-six thousand, three hundred eighty-one".