3638991172996 has 27 divisors (see below), whose sum is σ = 6401732183301. Its totient is φ = 1809974685024.

The previous prime is 3638991172951. The next prime is 3638991172997. The reversal of 3638991172996 is 6992711998363.

The square root of 3638991172996 is 1907614.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3143848148100 + 495143024896 = 1773090^2 + 703664^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3638991172997) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 759227976 + ... + 759232768.

Almost surely, 2^{3638991172996} is an apocalyptic number.

3638991172996 is the 1907614-th square number.

It is an amenable number.

3638991172996 is a deficient number, since it is larger than the sum of its proper divisors (2762741010305).

3638991172996 is an frugal number, since it uses more digits than its factorization.

3638991172996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9988 (or 4994 counting only the distinct ones).

The product of its digits is 238085568, while the sum is 73.

The spelling of 3638991172996 in words is "three trillion, six hundred thirty-eight billion, nine hundred ninety-one million, one hundred seventy-two thousand, nine hundred ninety-six".