636343180609 has 2 divisors, whose sum is σ = 636343180610. Its totient is φ = 636343180608.

The previous prime is 636343180589. The next prime is 636343180637. The reversal of 636343180609 is 906081343636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636330076209 + 13104400 = 797703^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 636343180609 - 2⁹ = 636343180097 is a prime.

It is a super-2 number, since 2×636343180609² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (636143180609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318171590304 + 318171590305.

It is an arithmetic number, because the mean of its divisors is an integer number (318171590305).

Almost surely, 2^636343180609 is an apocalyptic number.

It is an amenable number.

636343180609 is a deficient number, since it is larger than the sum of its proper divisors (1).

636343180609 is an equidigital number, since it uses as much as digits as its factorization.

636343180609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 49.

The spelling of 636343180609 in words is "six hundred thirty-six billion, three hundred forty-three million, one hundred eighty thousand, six hundred nine".