166556266 has 8 divisors (see below), whose sum is σ = 252844704. Its totient is φ = 82274700.

The previous prime is 166556249. The next prime is 166556267. The reversal of 166556266 is 662655661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (166556267) 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, 501510 + ... + 501841.

It is an arithmetic number, because the mean of its divisors is an integer number (31605588).

Almost surely, 2^166556266 is an apocalyptic number.

166556266 is a deficient number, since it is larger than the sum of its proper divisors (86288438).

166556266 is a wasteful number, since it uses less digits than its factorization.

166556266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003436.

The product of its digits is 388800, while the sum is 43.

The square root of 166556266 is about 12905.6679796127. The cubic root of 166556266 is about 550.1996696528.

The spelling of 166556266 in words is "one hundred sixty-six million, five hundred fifty-six thousand, two hundred sixty-six".