99766666 has 4 divisors (see below), whose sum is σ = 149650002. Its totient is φ = 49883332.

The previous prime is 99766633. The next prime is 99766673. The reversal of 99766666 is 66666799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66666799 = 71 ⋅938969.

It can be written as a sum of positive squares in only one way, i.e., 92717641 + 7049025 = 9629^2 + 2655^2 .

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24941665 + ... + 24941668.

Almost surely, 2^99766666 is an apocalyptic number.

99766666 is a deficient number, since it is larger than the sum of its proper divisors (49883336).

99766666 is a wasteful number, since it uses less digits than its factorization.

99766666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49883335.

The product of its digits is 4408992, while the sum is 55.

The square root of 99766666 is about 9988.3264864541. The cubic root of 99766666 is about 463.7975887113.

The spelling of 99766666 in words is "ninety-nine million, seven hundred sixty-six thousand, six hundred sixty-six".