636303442161 has 4 divisors (see below), whose sum is σ = 848404589552. Its totient is φ = 424202294772.

The previous prime is 636303442139. The next prime is 636303442259. The reversal of 636303442161 is 161244303636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 636303442161 - 2¹⁵ = 636303409393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636303442121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106050573691 + ... + 106050573696.

It is an arithmetic number, because the mean of its divisors is an integer number (212101147388).

Almost surely, 2^636303442161 is an apocalyptic number.

It is an amenable number.

636303442161 is a deficient number, since it is larger than the sum of its proper divisors (212101147391).

636303442161 is a wasteful number, since it uses less digits than its factorization.

636303442161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212101147390.

The product of its (nonzero) digits is 186624, while the sum is 39.

Adding to 636303442161 its reverse (161244303636), we get a palindrome (797547745797).

The spelling of 636303442161 in words is "six hundred thirty-six billion, three hundred three million, four hundred forty-two thousand, one hundred sixty-one".