166563266 has 4 divisors (see below), whose sum is σ = 249844902. Its totient is φ = 83281632.

The previous prime is 166563239. The next prime is 166563277. The reversal of 166563266 is 662365661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 142110241 + 24453025 = 11921^2 + 4945^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41640815 + ... + 41640818.

Almost surely, 2^166563266 is an apocalyptic number.

166563266 is a deficient number, since it is larger than the sum of its proper divisors (83281636).

166563266 is an equidigital number, since it uses as much as digits as its factorization.

166563266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83281635.

The product of its digits is 233280, while the sum is 41.

The square root of 166563266 is about 12905.9391754339. The cubic root of 166563266 is about 550.2073774459.

The spelling of 166563266 in words is "one hundred sixty-six million, five hundred sixty-three thousand, two hundred sixty-six".