3636817969921 has 4 divisors (see below), whose sum is σ = 3714197075712. Its totient is φ = 3559438864132.

The previous prime is 3636817969909. The next prime is 3636817969943. The reversal of 3636817969921 is 1299697186363.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3636817969921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3636817967921) 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 3 ways as a sum of consecutive naturals, for example, 38689552825 + ... + 38689552918.

It is an arithmetic number, because the mean of its divisors is an integer number (928549268928).

Almost surely, 2^{3636817969921} is an apocalyptic number.

It is an amenable number.

3636817969921 is a deficient number, since it is larger than the sum of its proper divisors (77379105791).

3636817969921 is an equidigital number, since it uses as much as digits as its factorization.

3636817969921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77379105790.

The product of its digits is 158723712, while the sum is 70.

The spelling of 3636817969921 in words is "three trillion, six hundred thirty-six billion, eight hundred seventeen million, nine hundred sixty-nine thousand, nine hundred twenty-one".