9966599 has 2 divisors, whose sum is σ = 9966600. Its totient is φ = 9966598.

The previous prime is 9966587. The next prime is 9966623. The reversal of 9966599 is 9956699.

It is a weak prime.

It is an emirp because it is prime and its reverse (9956699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9966599 - 2²⁰ = 8918023 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9966599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9966529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983299 + 4983300.

It is an arithmetic number, because the mean of its divisors is an integer number (4983300).

Almost surely, 2^9966599 is an apocalyptic number.

9966599 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966599 is an equidigital number, since it uses as much as digits as its factorization.

9966599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1180980, while the sum is 53.

The square root of 9966599 is about 3156.9920810797. The cubic root of 9966599 is about 215.2033338690.

The spelling of 9966599 in words is "nine million, nine hundred sixty-six thousand, five hundred ninety-nine".