99645663 has 16 divisors (see below), whose sum is σ = 146410880. Its totient is φ = 59893344.

The previous prime is 99645661. The next prime is 99645673. The reversal of 99645663 is 36654699.

It is a happy number.

It is not a de Polignac number, because 99645663 - 2¹ = 99645661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99645661) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 28033 + ... + 31386.

It is an arithmetic number, because the mean of its divisors is an integer number (9150680).

Almost surely, 2^99645663 is an apocalyptic number.

99645663 is a deficient number, since it is larger than the sum of its proper divisors (46765217).

99645663 is a wasteful number, since it uses less digits than its factorization.

99645663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59478.

The product of its digits is 1049760, while the sum is 48.

The square root of 99645663 is about 9982.2674277941. The cubic root of 99645663 is about 463.6100056701.

Subtracting from 99645663 its product of digits (1049760), we obtain a triangular number (98595903 = T₁₄₀₄₂).

The spelling of 99645663 in words is "ninety-nine million, six hundred forty-five thousand, six hundred sixty-three".