636321887841 has 8 divisors (see below), whose sum is σ = 875797867264. Its totient is φ = 410530250160.

The previous prime is 636321887809. The next prime is 636321887843. The reversal of 636321887841 is 148788123636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636321887841 - 2⁵ = 636321887809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636321887843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3421085326 + ... + 3421085511.

It is an arithmetic number, because the mean of its divisors is an integer number (109474733408).

Almost surely, 2^636321887841 is an apocalyptic number.

It is an amenable number.

636321887841 is a deficient number, since it is larger than the sum of its proper divisors (239475979423).

636321887841 is a wasteful number, since it uses less digits than its factorization.

636321887841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6842170871.

The product of its digits is 9289728, while the sum is 57.

The spelling of 636321887841 in words is "six hundred thirty-six billion, three hundred twenty-one million, eight hundred eighty-seven thousand, eight hundred forty-one".