99765666 has 192 divisors, whose sum is σ = 298771200. Its totient is φ = 23708160.

The previous prime is 99765649. The next prime is 99765667. The reversal of 99765666 is 66656799.

It is a super-2 number, since 2×99765666² = 19906376224847112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99765667) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 882826 + ... + 882938.

It is an arithmetic number, because the mean of its divisors is an integer number (1556100).

Almost surely, 2^99765666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99765666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149385600).

99765666 is an abundant number, since it is smaller than the sum of its proper divisors (199005534).

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

99765666 is a wasteful number, since it uses less digits than its factorization.

99765666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 149 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 99765666 is about 9988.2764278929. The cubic root of 99765666 is about 463.7960390984.

The spelling of 99765666 in words is "ninety-nine million, seven hundred sixty-five thousand, six hundred sixty-six".