99669966 has 64 divisors (see below), whose sum is σ = 223520256. Its totient is φ = 29376000.

The previous prime is 99669961. The next prime is 99669967. The reversal of 99669966 is 66996699.

99669966 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99669961) 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 31 ways as a sum of consecutive naturals, for example, 659991 + ... + 660141.

It is an arithmetic number, because the mean of its divisors is an integer number (3492504).

Almost surely, 2^99669966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99669966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111760128).

99669966 is an abundant number, since it is smaller than the sum of its proper divisors (123850290).

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

99669966 is a wasteful number, since it uses less digits than its factorization.

99669966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377.

The product of its digits is 8503056, while the sum is 60.

The square root of 99669966 is about 9983.4846621808. The cubic root of 99669966 is about 463.6476932047.

The spelling of 99669966 in words is "ninety-nine million, six hundred sixty-nine thousand, nine hundred sixty-six".