636664635031441 has 2 divisors, whose sum is σ = 636664635031442. Its totient is φ = 636664635031440.

The previous prime is 636664635031433. The next prime is 636664635031457. The reversal of 636664635031441 is 144130536466636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439209303497041 + 197455331534400 = 20957321^2 + 14051880^2 .

It is a cyclic number.

It is not a de Polignac number, because 636664635031441 - 2³ = 636664635031433 is a prime.

It is not a weakly prime, because it can be changed into another prime (636664935031441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318332317515720 + 318332317515721.

It is an arithmetic number, because the mean of its divisors is an integer number (318332317515721).

Almost surely, 2^{636664635031441} is an apocalyptic number.

It is an amenable number.

636664635031441 is a deficient number, since it is larger than the sum of its proper divisors (1).

636664635031441 is an equidigital number, since it uses as much as digits as its factorization.

636664635031441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67184640, while the sum is 58.

The spelling of 636664635031441 in words is "six hundred thirty-six trillion, six hundred sixty-four billion, six hundred thirty-five million, thirty-one thousand, four hundred forty-one".