166225219 has 2 divisors, whose sum is σ = 166225220. Its totient is φ = 166225218.

The previous prime is 166225177. The next prime is 166225237. The reversal of 166225219 is 912522661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166225219 - 2¹¹ = 166223171 is a prime.

It is a super-2 number, since 2×166225219² = 55261646863195922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166225259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83112609 + 83112610.

It is an arithmetic number, because the mean of its divisors is an integer number (83112610).

Almost surely, 2^166225219 is an apocalyptic number.

166225219 is a deficient number, since it is larger than the sum of its proper divisors (1).

166225219 is an equidigital number, since it uses as much as digits as its factorization.

166225219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 166225219 is about 12892.8359564527. The cubic root of 166225219 is about 549.8349025126.

The spelling of 166225219 in words is "one hundred sixty-six million, two hundred twenty-five thousand, two hundred nineteen".