99966643 has 8 divisors (see below), whose sum is σ = 114437120. Its totient is φ = 85543560.

The previous prime is 99966631. The next prime is 99966673. The reversal of 99966643 is 34666999.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 99966643 - 2⁹ = 99966131 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99966673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7203 + ... + 15868.

It is an arithmetic number, because the mean of its divisors is an integer number (14304640).

Almost surely, 2^99966643 is an apocalyptic number.

99966643 is a deficient number, since it is larger than the sum of its proper divisors (14470477).

99966643 is a wasteful number, since it uses less digits than its factorization.

99966643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23697.

The product of its digits is 1889568, while the sum is 52.

The square root of 99966643 is about 9998.3320108906. The cubic root of 99966643 is about 464.1072677955.

The spelling of 99966643 in words is "ninety-nine million, nine hundred sixty-six thousand, six hundred forty-three".