166231222 has 8 divisors (see below), whose sum is σ = 253434672. Its totient is φ = 81753000.

The previous prime is 166231201. The next prime is 166231229. The reversal of 166231222 is 222132661.

166231222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×166231222² = 55265638335226568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166231229) 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, 681154 + ... + 681397.

It is an arithmetic number, because the mean of its divisors is an integer number (31679334).

Almost surely, 2^166231222 is an apocalyptic number.

166231222 is a deficient number, since it is larger than the sum of its proper divisors (87203450).

166231222 is a wasteful number, since it uses less digits than its factorization.

166231222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362614.

The product of its digits is 1728, while the sum is 25.

The square root of 166231222 is about 12893.0687580576. The cubic root of 166231222 is about 549.8415212820.

Adding to 166231222 its reverse (222132661), we get a palindrome (388363883).

The spelling of 166231222 in words is "one hundred sixty-six million, two hundred thirty-one thousand, two hundred twenty-two".