166213227 has 32 divisors (see below), whose sum is σ = 235984896. Its totient is φ = 103910400.

The previous prime is 166213183. The next prime is 166213237. The reversal of 166213227 is 722312661.

It is not a de Polignac number, because 166213227 - 2¹⁰ = 166212203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166213194 and 166213203.

It is not an unprimeable number, because it can be changed into a prime (166213237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 470683 + ... + 471035.

It is an arithmetic number, because the mean of its divisors is an integer number (7374528).

Almost surely, 2^166213227 is an apocalyptic number.

166213227 is a deficient number, since it is larger than the sum of its proper divisors (69771669).

166213227 is a wasteful number, since it uses less digits than its factorization.

166213227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531.

The product of its digits is 6048, while the sum is 30.

The square root of 166213227 is about 12892.3708835885. The cubic root of 166213227 is about 549.8216799327.

Adding to 166213227 its reverse (722312661), we get a palindrome (888525888).

The spelling of 166213227 in words is "one hundred sixty-six million, two hundred thirteen thousand, two hundred twenty-seven".