99777666 has 8 divisors (see below), whose sum is σ = 199555344. Its totient is φ = 33259220.

The previous prime is 99777659. The next prime is 99777697. The reversal of 99777666 is 66677799.

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

99777666 is an admirable number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8314800 + ... + 8314811.

It is an arithmetic number, because the mean of its divisors is an integer number (24944418).

Almost surely, 2^99777666 is an apocalyptic number.

99777666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

99777666 is a wasteful number, since it uses less digits than its factorization.

99777666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16629616.

The product of its digits is 6001128, while the sum is 57.

The square root of 99777666 is about 9988.8771140704. The cubic root of 99777666 is about 463.8146337699.

The spelling of 99777666 in words is "ninety-nine million, seven hundred seventy-seven thousand, six hundred sixty-six".