636666341 has 2 divisors, whose sum is σ = 636666342. Its totient is φ = 636666340.

The previous prime is 636666323. The next prime is 636666353. The reversal of 636666341 is 143666636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389233441 + 247432900 = 19729^2 + 15730^2 .

It is a cyclic number.

It is not a de Polignac number, because 636666341 - 2¹⁴ = 636649957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636666311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318333170 + 318333171.

It is an arithmetic number, because the mean of its divisors is an integer number (318333171).

Almost surely, 2^636666341 is an apocalyptic number.

It is an amenable number.

636666341 is a deficient number, since it is larger than the sum of its proper divisors (1).

636666341 is an equidigital number, since it uses as much as digits as its factorization.

636666341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 41.

The square root of 636666341 is about 25232.2480369863. The cubic root of 636666341 is about 860.2749891302.

It can be divided in two parts, 63666 and 6341, that added together give a palindrome (70007).

The spelling of 636666341 in words is "six hundred thirty-six million, six hundred sixty-six thousand, three hundred forty-one".