66344191 has 8 divisors (see below), whose sum is σ = 68118624. Its totient is φ = 64577280.

The previous prime is 66344177. The next prime is 66344209. The reversal of 66344191 is 19144366.

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 66344191 - 2⁷ = 66344063 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 (66344101) 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, 19015 + ... + 22231.

It is an arithmetic number, because the mean of its divisors is an integer number (8514828).

Almost surely, 2^66344191 is an apocalyptic number.

66344191 is a deficient number, since it is larger than the sum of its proper divisors (1774433).

66344191 is a wasteful number, since it uses less digits than its factorization.

66344191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761.

The product of its digits is 15552, while the sum is 34.

The square root of 66344191 is about 8145.1943500447. The cubic root of 66344191 is about 404.8252886625.

The spelling of 66344191 in words is "sixty-six million, three hundred forty-four thousand, one hundred ninety-one".