166820224 has 16 divisors (see below), whose sum is σ = 332337420. Its totient is φ = 83410048.

The previous prime is 166820221. The next prime is 166820239. The reversal of 166820224 is 422028661.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166820221) 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, 651514 + ... + 651769.

Almost surely, 2^166820224 is an apocalyptic number.

It is an amenable number.

166820224 is a deficient number, since it is larger than the sum of its proper divisors (165517196).

166820224 is an equidigital number, since it uses as much as digits as its factorization.

166820224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303297 (or 1303285 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 166820224 is about 12915.8903680699. The cubic root of 166820224 is about 550.4901679841.

Adding to 166820224 its reverse (422028661), we get a palindrome (588848885).

The spelling of 166820224 in words is "one hundred sixty-six million, eight hundred twenty thousand, two hundred twenty-four".