99666666 has 64 divisors (see below), whose sum is σ = 254361600. Its totient is φ = 28609200.

The previous prime is 99666661. The next prime is 99666667. The reversal of 99666666 is 66666699.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

99666666 is a modest number, since divided by 66666 gives 996 as remainder.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99666661) 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, 6871 + ... + 15701.

It is an arithmetic number, because the mean of its divisors is an integer number (3974400).

Almost surely, 2^99666666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99666666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127180800).

99666666 is an abundant number, since it is smaller than the sum of its proper divisors (154694934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99666666 is a wasteful number, since it uses less digits than its factorization.

99666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8872 (or 8866 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The square root of 99666666 is about 9983.3193878589. The cubic root of 99666666 is about 463.6425761357.

The spelling of 99666666 in words is "ninety-nine million, six hundred sixty-six thousand, six hundred sixty-six".