99999966600 has 144 divisors (see below), whose sum is σ = 344910024420. Its totient is φ = 25945920000.

The previous prime is 99999966581. The next prime is 99999966623. The reversal of 99999966600 is 666999999.

It can be written as a sum of positive squares in 6 ways, for example, as 43850872836 + 56149093764 = 209406^2 + 236958^2 .

It is a super-2 number, since 2×99999966600² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 684151 + ... + 817350.

Almost surely, 2^99999966600 is an apocalyptic number.

99999966600 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99999966600 is an abundant number, since it is smaller than the sum of its proper divisors (244910057820).

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

99999966600 is a wasteful number, since it uses less digits than its factorization.

99999966600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501560 (or 1501548 counting only the distinct ones).

The product of its (nonzero) digits is 114791256, while the sum is 72.

The spelling of 99999966600 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred sixty-six thousand, six hundred".