636081338841 has 8 divisors (see below), whose sum is σ = 913347563520. Its totient is φ = 391434670032.

The previous prime is 636081338839. The next prime is 636081338873. The reversal of 636081338841 is 148833180636.

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

It is not a de Polignac number, because 636081338841 - 2¹ = 636081338839 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (636081338821) 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, 8154888921 + ... + 8154888998.

It is an arithmetic number, because the mean of its divisors is an integer number (114168445440).

Almost surely, 2^636081338841 is an apocalyptic number.

It is an amenable number.

636081338841 is a deficient number, since it is larger than the sum of its proper divisors (277266224679).

636081338841 is a wasteful number, since it uses less digits than its factorization.

636081338841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16309777935.

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 636081338841 in words is "six hundred thirty-six billion, eighty-one million, three hundred thirty-eight thousand, eight hundred forty-one".