66222191 has 16 divisors (see below), whose sum is σ = 80974656. Its totient is φ = 52862976.

The previous prime is 66222133. The next prime is 66222199. The reversal of 66222191 is 19122266.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66222191 - 2¹⁴ = 66205807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66222199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8675 + ... + 14411.

It is an arithmetic number, because the mean of its divisors is an integer number (5060916).

Almost surely, 2^66222191 is an apocalyptic number.

66222191 is a deficient number, since it is larger than the sum of its proper divisors (14752465).

66222191 is a wasteful number, since it uses less digits than its factorization.

66222191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5858.

The product of its digits is 2592, while the sum is 29.

The square root of 66222191 is about 8137.7018254542. The cubic root of 66222191 is about 404.5769926727.

The spelling of 66222191 in words is "sixty-six million, two hundred twenty-two thousand, one hundred ninety-one".