6564966808837 has 2 divisors, whose sum is σ = 6564966808838. Its totient is φ = 6564966808836.

The previous prime is 6564966808759. The next prime is 6564966808889. The reversal of 6564966808837 is 7388086694656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4843494230436 + 1721472578401 = 2200794^2 + 1312049^2 .

It is a cyclic number.

It is not a de Polignac number, because 6564966808837 - 2¹⁹ = 6564966284549 is a prime.

It is a super-2 number, since 2×6564966808837² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6564966208837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282483404418 + 3282483404419.

It is an arithmetic number, because the mean of its divisors is an integer number (3282483404419).

Almost surely, 2^{6564966808837} is an apocalyptic number.

It is an amenable number.

6564966808837 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564966808837 is an equidigital number, since it uses as much as digits as its factorization.

6564966808837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2508226560, while the sum is 76.

The spelling of 6564966808837 in words is "six trillion, five hundred sixty-four billion, nine hundred sixty-six million, eight hundred eight thousand, eight hundred thirty-seven".