166651111 has 8 divisors (see below), whose sum is σ = 183602448. Its totient is φ = 150000000.

The previous prime is 166651103. The next prime is 166651193. The reversal of 166651111 is 111156661.

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

It is a 8-Lehmer number, since φ(166651111) divides (166651111-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 166651111 - 2³ = 166651103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166651111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166651711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73890 + ... + 76111.

It is an arithmetic number, because the mean of its divisors is an integer number (22950306).

Almost surely, 2^166651111 is an apocalyptic number.

166651111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166651111 is a deficient number, since it is larger than the sum of its proper divisors (16951337).

166651111 is a wasteful number, since it uses less digits than its factorization.

166651111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150113.

The product of its digits is 1080, while the sum is 28.

The square root of 166651111 is about 12909.3420049203. The cubic root of 166651111 is about 550.3040863899.

The spelling of 166651111 in words is "one hundred sixty-six million, six hundred fifty-one thousand, one hundred eleven".