166121224 has 8 divisors (see below), whose sum is σ = 311477310. Its totient is φ = 83060608.

The previous prime is 166121213. The next prime is 166121227. The reversal of 166121224 is 422121661.

It is a happy number.

166121224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 89908324 + 76212900 = 9482^2 + 8730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×166121224² = 55192522126516352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166121227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382569 + ... + 10382584.

Almost surely, 2^166121224 is an apocalyptic number.

It is an amenable number.

166121224 is a deficient number, since it is larger than the sum of its proper divisors (145356086).

166121224 is a wasteful number, since it uses less digits than its factorization.

166121224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20765159 (or 20765155 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 166121224 is about 12888.8022717396. The cubic root of 166121224 is about 549.7202147220.

Adding to 166121224 its reverse (422121661), we get a palindrome (588242885).

The spelling of 166121224 in words is "one hundred sixty-six million, one hundred twenty-one thousand, two hundred twenty-four".