66832217 has 4 divisors (see below), whose sum is σ = 66867216. Its totient is φ = 66797220.

The previous prime is 66832201. The next prime is 66832267. The reversal of 66832217 is 71223866.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 66832217 - 2⁴ = 66832201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66832267) 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, 14459 + ... + 18512.

It is an arithmetic number, because the mean of its divisors is an integer number (16716804).

Almost surely, 2^66832217 is an apocalyptic number.

It is an amenable number.

66832217 is a deficient number, since it is larger than the sum of its proper divisors (34999).

66832217 is a wasteful number, since it uses less digits than its factorization.

66832217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34998.

The product of its digits is 24192, while the sum is 35.

The square root of 66832217 is about 8175.0973694507. The cubic root of 66832217 is about 405.8154924528.

The spelling of 66832217 in words is "sixty-six million, eight hundred thirty-two thousand, two hundred seventeen".