99988666 has 8 divisors (see below), whose sum is σ = 150214644. Its totient is φ = 49917120.

The previous prime is 99988649. The next prime is 99988753. The reversal of 99988666 is 66688999.

It can be written as a sum of positive squares in 2 ways, for example, as 98109025 + 1879641 = 9905^2 + 1371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

99988666 is a strobogrammatic number because it is the same when read upside-down.

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 3 ways as a sum of consecutive naturals, for example, 36975 + ... + 39586.

Almost surely, 2^99988666 is an apocalyptic number.

99988666 is a deficient number, since it is larger than the sum of its proper divisors (50225978).

99988666 is a wasteful number, since it uses less digits than its factorization.

99988666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77216.

The product of its digits is 10077696, while the sum is 61.

The square root of 99988666 is about 9999.4332839416. The cubic root of 99988666 is about 464.1413467761.

The spelling of 99988666 in words is "ninety-nine million, nine hundred eighty-eight thousand, six hundred sixty-six".