166231223 has 4 divisors (see below), whose sum is σ = 166393488. Its totient is φ = 166068960.

The previous prime is 166231201. The next prime is 166231229. The reversal of 166231223 is 322132661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322132661 = 3769 ⋅85469.

It is a cyclic number.

It is not a de Polignac number, because 166231223 - 2⁶ = 166231159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166231192 and 166231201.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79586 + ... + 81647.

It is an arithmetic number, because the mean of its divisors is an integer number (41598372).

Almost surely, 2^166231223 is an apocalyptic number.

166231223 is a deficient number, since it is larger than the sum of its proper divisors (162265).

166231223 is a wasteful number, since it uses less digits than its factorization.

166231223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162264.

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

The square root of 166231223 is about 12893.0687968381. The cubic root of 166231223 is about 549.8415223845.

Adding to 166231223 its reverse (322132661), we get a palindrome (488363884).

The spelling of 166231223 in words is "one hundred sixty-six million, two hundred thirty-one thousand, two hundred twenty-three".