166651211 has 4 divisors (see below), whose sum is σ = 168760800. Its totient is φ = 164541624.

The previous prime is 166651201. The next prime is 166651213. The reversal of 166651211 is 112156661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112156661 = 2131 ⋅52631.

It is a cyclic number.

It is not a de Polignac number, because 166651211 - 2²² = 162456907 is a prime.

It is a super-2 number, since 2×166651211² = 55545252255533042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166651213) 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, 1054676 + ... + 1054833.

It is an arithmetic number, because the mean of its divisors is an integer number (42190200).

Almost surely, 2^166651211 is an apocalyptic number.

166651211 is a deficient number, since it is larger than the sum of its proper divisors (2109589).

166651211 is an equidigital number, since it uses as much as digits as its factorization.

166651211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109588.

The product of its digits is 2160, while the sum is 29.

The square root of 166651211 is about 12909.3458780838. The cubic root of 166651211 is about 550.3041964609.

The spelling of 166651211 in words is "one hundred sixty-six million, six hundred fifty-one thousand, two hundred eleven".