5646663865441 has 3 divisors (see below), whose sum is σ = 5646666241713. Its totient is φ = 5646661489170.

The previous prime is 5646663865421. The next prime is 5646663865543. The reversal of 5646663865441 is 1445683666465.

The square root of 5646663865441 is 2376271.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 5646663865441 - 2¹³ = 5646663857249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5646663865421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1188136 + ... + 3564406.

It is an arithmetic number, because the mean of its divisors is an integer number (1882222080571).

Almost surely, 2^{5646663865441} is an apocalyptic number.

5646663865441 is the 2376271-st square number.

5646663865441 is the 1188136-th centered octagonal number.

It is an amenable number.

5646663865441 is a deficient number, since it is larger than the sum of its proper divisors (2376272).

5646663865441 is an frugal number, since it uses more digits than its factorization.

5646663865441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752542 (or 2376271 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 64.

Multiplying 5646663865441 by its sum of digits (64), we get a square (361386487388224 = 19010168²).

The spelling of 5646663865441 in words is "five trillion, six hundred forty-six billion, six hundred sixty-three million, eight hundred sixty-five thousand, four hundred forty-one".