636693334009 has 2 divisors, whose sum is σ = 636693334010. Its totient is φ = 636693334008.

The previous prime is 636693334001. The next prime is 636693334021. The reversal of 636693334009 is 900433396636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636599728384 + 93605625 = 797872^2 + 9675^2 .

It is a cyclic number.

It is not a de Polignac number, because 636693334009 - 2³ = 636693334001 is a prime.

It is not a weakly prime, because it can be changed into another prime (636693334001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318346667004 + 318346667005.

It is an arithmetic number, because the mean of its divisors is an integer number (318346667005).

Almost surely, 2^636693334009 is an apocalyptic number.

It is an amenable number.

636693334009 is a deficient number, since it is larger than the sum of its proper divisors (1).

636693334009 is an equidigital number, since it uses as much as digits as its factorization.

636693334009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5668704, while the sum is 52.

The spelling of 636693334009 in words is "six hundred thirty-six billion, six hundred ninety-three million, three hundred thirty-four thousand, nine".