6566566499 has 2 divisors, whose sum is σ = 6566566500. Its totient is φ = 6566566498.

The previous prime is 6566566471. The next prime is 6566566547. The reversal of 6566566499 is 9946656656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6566566499 - 2¹² = 6566562403 is a prime.

It is not a weakly prime, because it can be changed into another prime (6566566429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3283283249 + 3283283250.

It is an arithmetic number, because the mean of its divisors is an integer number (3283283250).

Almost surely, 2^6566566499 is an apocalyptic number.

6566566499 is a deficient number, since it is larger than the sum of its proper divisors (1).

6566566499 is an equidigital number, since it uses as much as digits as its factorization.

6566566499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62985600, while the sum is 62.

The square root of 6566566499 is about 81034.3538198461. The cubic root of 6566566499 is about 1872.6047279665.

The spelling of 6566566499 in words is "six billion, five hundred sixty-six million, five hundred sixty-six thousand, four hundred ninety-nine".