99666499 has 2 divisors, whose sum is σ = 99666500. Its totient is φ = 99666498.

The previous prime is 99666487. The next prime is 99666527. The reversal of 99666499 is 99466699.

It is a weak prime.

It is an emirp because it is prime and its reverse (99466699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99666499 - 2⁹ = 99665987 is a prime.

It is a super-2 number, since 2×99666499² = 19866822045834002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99666899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49833249 + 49833250.

It is an arithmetic number, because the mean of its divisors is an integer number (49833250).

Almost surely, 2^99666499 is an apocalyptic number.

99666499 is a deficient number, since it is larger than the sum of its proper divisors (1).

99666499 is an equidigital number, since it uses as much as digits as its factorization.

99666499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 58.

The square root of 99666499 is about 9983.3110239038. The cubic root of 99666499 is about 463.6423171780.

It can be divided in two parts, 9966649 and 9, that multiplied together give a square (89699841 = 9471²).

The spelling of 99666499 in words is "ninety-nine million, six hundred sixty-six thousand, four hundred ninety-nine".