3644836938991 has 12 divisors (see below), whose sum is σ = 3794413906192. Its totient is φ = 3500918797824.

The previous prime is 3644836938979. The next prime is 3644836939021. The reversal of 3644836938991 is 1998396384463.

It is not a de Polignac number, because 3644836938991 - 2³¹ = 3642689455343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644836938931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11065491 + ... + 11390116.

Almost surely, 2^{3644836938991} is an apocalyptic number.

3644836938991 is a deficient number, since it is larger than the sum of its proper divisors (149576967201).

3644836938991 is a wasteful number, since it uses less digits than its factorization.

3644836938991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22455858 (or 22455829 counting only the distinct ones).

The product of its digits is 725594112, while the sum is 73.

The spelling of 3644836938991 in words is "three trillion, six hundred forty-four billion, eight hundred thirty-six million, nine hundred thirty-eight thousand, nine hundred ninety-one".