99666699 has 32 divisors (see below), whose sum is σ = 155105280. Its totient is φ = 56256000.

The previous prime is 99666667. The next prime is 99666709.

99666699 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99666699 - 2⁵ = 99666667 is a prime.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99666499) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55782 + ... + 57540.

It is an arithmetic number, because the mean of its divisors is an integer number (4847040).

Almost surely, 2^99666699 is an apocalyptic number.

99666699 is a deficient number, since it is larger than the sum of its proper divisors (55438581).

99666699 is a wasteful number, since it uses less digits than its factorization.

99666699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891.

The product of its digits is 8503056, while the sum is 60.

The square root of 99666699 is about 9983.3210406157. The cubic root of 99666699 is about 463.6426273069.

The spelling of 99666699 in words is "ninety-nine million, six hundred sixty-six thousand, six hundred ninety-nine".