5664634266521 has 2 divisors, whose sum is σ = 5664634266522. Its totient is φ = 5664634266520.

The previous prime is 5664634266491. The next prime is 5664634266541. The reversal of 5664634266521 is 1256624364665.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5596820377600 + 67813888921 = 2365760^2 + 260411^2 .

It is a cyclic number.

It is not a de Polignac number, because 5664634266521 - 2¹⁰ = 5664634265497 is a prime.

It is a super-2 number, since 2×5664634266521² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5664634266541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832317133260 + 2832317133261.

It is an arithmetic number, because the mean of its divisors is an integer number (2832317133261).

Almost surely, 2^{5664634266521} is an apocalyptic number.

It is an amenable number.

5664634266521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5664634266521 is an equidigital number, since it uses as much as digits as its factorization.

5664634266521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37324800, while the sum is 56.

The spelling of 5664634266521 in words is "five trillion, six hundred sixty-four billion, six hundred thirty-four million, two hundred sixty-six thousand, five hundred twenty-one".