6564033661 has 2 divisors, whose sum is σ = 6564033662. Its totient is φ = 6564033660.

The previous prime is 6564033611. The next prime is 6564033667. The reversal of 6564033661 is 1663304656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5488587225 + 1075446436 = 74085^2 + 32794^2 .

It is a cyclic number.

It is not a de Polignac number, because 6564033661 - 2¹⁹ = 6563509373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6564033667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282016830 + 3282016831.

It is an arithmetic number, because the mean of its divisors is an integer number (3282016831).

Almost surely, 2^6564033661 is an apocalyptic number.

It is an amenable number.

6564033661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564033661 is an equidigital number, since it uses as much as digits as its factorization.

6564033661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 6564033661 is about 81018.7241383126. The cubic root of 6564033661 is about 1872.3639316861.

The spelling of 6564033661 in words is "six billion, five hundred sixty-four million, thirty-three thousand, six hundred sixty-one".