636539963 has 2 divisors, whose sum is σ = 636539964. Its totient is φ = 636539962.

The previous prime is 636539861. The next prime is 636539977. The reversal of 636539963 is 369935636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 636539963 - 2²⁰ = 635491387 is a prime.

It is not a weakly prime, because it can be changed into another prime (636539663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318269981 + 318269982.

It is an arithmetic number, because the mean of its divisors is an integer number (318269982).

Almost surely, 2^636539963 is an apocalyptic number.

636539963 is a deficient number, since it is larger than the sum of its proper divisors (1).

636539963 is an equidigital number, since it uses as much as digits as its factorization.

636539963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2361960, while the sum is 50.

The square root of 636539963 is about 25229.7436174052. The cubic root of 636539963 is about 860.2180639561.

The spelling of 636539963 in words is "six hundred thirty-six million, five hundred thirty-nine thousand, nine hundred sixty-three".