166322213 has 4 divisors (see below), whose sum is σ = 166910208. Its totient is φ = 165734220.

The previous prime is 166322197. The next prime is 166322231. The reversal of 166322213 is 312223661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 312223661 = 31 ⋅10071731.

It is a cyclic number.

It is not a de Polignac number, because 166322213 - 2⁴ = 166322197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166322263) 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 in 3 ways as a sum of consecutive naturals, for example, 293573 + ... + 294138.

It is an arithmetic number, because the mean of its divisors is an integer number (41727552).

Almost surely, 2^166322213 is an apocalyptic number.

It is an amenable number.

166322213 is a deficient number, since it is larger than the sum of its proper divisors (587995).

166322213 is an equidigital number, since it uses as much as digits as its factorization.

166322213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587994.

The product of its digits is 2592, while the sum is 26.

The square root of 166322213 is about 12896.5969542356. The cubic root of 166322213 is about 549.9418263541.

Adding to 166322213 its reverse (312223661), we get a palindrome (478545874).

The spelling of 166322213 in words is "one hundred sixty-six million, three hundred twenty-two thousand, two hundred thirteen".