66384199 has 4 divisors (see below), whose sum is σ = 75867664. Its totient is φ = 56900736.

The previous prime is 66384193. The next prime is 66384209. The reversal of 66384199 is 99148366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66384199 - 2⁹ = 66383687 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 (66384193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4741722 + ... + 4741735.

It is an arithmetic number, because the mean of its divisors is an integer number (18966916).

Almost surely, 2^66384199 is an apocalyptic number.

66384199 is a deficient number, since it is larger than the sum of its proper divisors (9483465).

66384199 is an equidigital number, since it uses as much as digits as its factorization.

66384199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9483464.

The product of its digits is 279936, while the sum is 46.

The square root of 66384199 is about 8147.6499065682. The cubic root of 66384199 is about 404.9066471826.

The spelling of 66384199 in words is "sixty-six million, three hundred eighty-four thousand, one hundred ninety-nine".