66044217 has 4 divisors (see below), whose sum is σ = 88058960. Its totient is φ = 44029476.

The previous prime is 66044207. The next prime is 66044221. The reversal of 66044217 is 71244066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66044217 - 2⁷ = 66044089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66044207) 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, 11007367 + ... + 11007372.

It is an arithmetic number, because the mean of its divisors is an integer number (22014740).

Almost surely, 2^66044217 is an apocalyptic number.

It is an amenable number.

66044217 is a deficient number, since it is larger than the sum of its proper divisors (22014743).

66044217 is a wasteful number, since it uses less digits than its factorization.

66044217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22014742.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 66044217 is about 8126.7593172186. The cubic root of 66044217 is about 404.2142301530.

The spelling of 66044217 in words is "sixty-six million, forty-four thousand, two hundred seventeen".