166556233 has 4 divisors (see below), whose sum is σ = 169379280. Its totient is φ = 163733188.

The previous prime is 166556213. The next prime is 166556239. The reversal of 166556233 is 332655661.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166556233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166556192 and 166556201.

It is not an unprimeable number, because it can be changed into a prime (166556239) 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, 1411435 + ... + 1411552.

It is an arithmetic number, because the mean of its divisors is an integer number (42344820).

Almost surely, 2^166556233 is an apocalyptic number.

It is an amenable number.

166556233 is a deficient number, since it is larger than the sum of its proper divisors (2823047).

166556233 is an equidigital number, since it uses as much as digits as its factorization.

166556233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823046.

The product of its digits is 97200, while the sum is 37.

The square root of 166556233 is about 12905.6667011046. Note that the first 3 decimals coincide. The cubic root of 166556233 is about 550.1996333155.

The spelling of 166556233 in words is "one hundred sixty-six million, five hundred fifty-six thousand, two hundred thirty-three".