5665430266021 has 2 divisors, whose sum is σ = 5665430266022. Its totient is φ = 5665430266020.

The previous prime is 5665430265991. The next prime is 5665430266033. The reversal of 5665430266021 is 1206620345665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5054578601121 + 610851664900 = 2248239^2 + 781570^2 .

It is a cyclic number.

It is not a de Polignac number, because 5665430266021 - 2⁷ = 5665430265893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5665430236021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832715133010 + 2832715133011.

It is an arithmetic number, because the mean of its divisors is an integer number (2832715133011).

Almost surely, 2^{5665430266021} is an apocalyptic number.

It is an amenable number.

5665430266021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5665430266021 is an equidigital number, since it uses as much as digits as its factorization.

5665430266021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 5665430266021 in words is "five trillion, six hundred sixty-five billion, four hundred thirty million, two hundred sixty-six thousand, twenty-one".