5665534621 has 2 divisors, whose sum is σ = 5665534622. Its totient is φ = 5665534620.

The previous prime is 5665534613. The next prime is 5665534669. The reversal of 5665534621 is 1264355665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5145192900 + 520341721 = 71730^2 + 22811^2 .

It is a cyclic number.

It is not a de Polignac number, because 5665534621 - 2³ = 5665534613 is a prime.

It is a super-2 number, since 2×5665534621² = 64196565083499227282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5665538621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832767310 + 2832767311.

It is an arithmetic number, because the mean of its divisors is an integer number (2832767311).

Almost surely, 2^5665534621 is an apocalyptic number.

It is an amenable number.

5665534621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5665534621 is an equidigital number, since it uses as much as digits as its factorization.

5665534621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 43.

The square root of 5665534621 is about 75269.7457216377. The cubic root of 5665534621 is about 1782.7083524083.

The spelling of 5665534621 in words is "five billion, six hundred sixty-five million, five hundred thirty-four thousand, six hundred twenty-one".