166223893 has 4 divisors (see below), whose sum is σ = 181335168. Its totient is φ = 151112620.

The previous prime is 166223887. The next prime is 166223899. The reversal of 166223893 is 398322661.

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.

It is an interprime number because it is at equal distance from previous prime (166223887) and next prime (166223899).

It is a cyclic number.

It is not a de Polignac number, because 166223893 - 2¹³ = 166215701 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 (166223899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7555621 + ... + 7555642.

It is an arithmetic number, because the mean of its divisors is an integer number (45333792).

Almost surely, 2^166223893 is an apocalyptic number.

It is an amenable number.

166223893 is a deficient number, since it is larger than the sum of its proper divisors (15111275).

166223893 is a wasteful number, since it uses less digits than its factorization.

166223893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15111274.

The product of its digits is 93312, while the sum is 40.

The square root of 166223893 is about 12892.7845324429. The cubic root of 166223893 is about 549.8334404740.

The spelling of 166223893 in words is "one hundred sixty-six million, two hundred twenty-three thousand, eight hundred ninety-three".