99966999 has 16 divisors (see below), whose sum is σ = 153060480. Its totient is φ = 57396960.

The previous prime is 99966991. The next prime is 99967001.

99966999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99966999 - 2³ = 99966991 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99966991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79092 + ... + 80345.

It is an arithmetic number, because the mean of its divisors is an integer number (9566280).

Almost surely, 2^99966999 is an apocalyptic number.

99966999 is a deficient number, since it is larger than the sum of its proper divisors (53093481).

99966999 is a wasteful number, since it uses less digits than its factorization.

99966999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159470.

The product of its digits is 19131876, while the sum is 66.

The square root of 99966999 is about 9998.3498138443. The cubic root of 99966999 is about 464.1078187192.

The spelling of 99966999 in words is "ninety-nine million, nine hundred sixty-six thousand, nine hundred ninety-nine".