636216653604431 has 2 divisors, whose sum is σ = 636216653604432. Its totient is φ = 636216653604430.

The previous prime is 636216653604397. The next prime is 636216653604529. The reversal of 636216653604431 is 134406356612636.

636216653604431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636216653604431 is a prime.

It is a super-2 number, since 2×636216653604431² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636216653606431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318108326802215 + 318108326802216.

It is an arithmetic number, because the mean of its divisors is an integer number (318108326802216).

Almost surely, 2^{636216653604431} is an apocalyptic number.

636216653604431 is a deficient number, since it is larger than the sum of its proper divisors (1).

636216653604431 is an equidigital number, since it uses as much as digits as its factorization.

636216653604431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33592320, while the sum is 56.

The spelling of 636216653604431 in words is "six hundred thirty-six trillion, two hundred sixteen billion, six hundred fifty-three million, six hundred four thousand, four hundred thirty-one".