99666407 has 2 divisors, whose sum is σ = 99666408. Its totient is φ = 99666406.

The previous prime is 99666403. The next prime is 99666443. The reversal of 99666407 is 70466699.

It is a weak prime.

It is an emirp because it is prime and its reverse (70466699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99666407 - 2² = 99666403 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99666403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49833203 + 49833204.

It is an arithmetic number, because the mean of its divisors is an integer number (49833204).

Almost surely, 2^99666407 is an apocalyptic number.

99666407 is a deficient number, since it is larger than the sum of its proper divisors (1).

99666407 is an equidigital number, since it uses as much as digits as its factorization.

99666407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 99666407 is about 9983.3064162130. The cubic root of 99666407 is about 463.6421745185.

The spelling of 99666407 in words is "ninety-nine million, six hundred sixty-six thousand, four hundred seven".