166666611 has 8 divisors (see below), whose sum is σ = 228228304. Its totient is φ = 108108000.

The previous prime is 166666603. The next prime is 166666627. The reversal of 166666611 is 116666661.

It is a happy number.

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

It is not a de Polignac number, because 166666611 - 2³ = 166666603 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 166666611.

It is not an unprimeable number, because it can be changed into a prime (166666631) 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, 750640 + ... + 750861.

It is an arithmetic number, because the mean of its divisors is an integer number (28528538).

Almost surely, 2^166666611 is an apocalyptic number.

166666611 is a deficient number, since it is larger than the sum of its proper divisors (61561693).

166666611 is a wasteful number, since it uses less digits than its factorization.

166666611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501541.

The product of its digits is 46656, while the sum is 39.

The square root of 166666611 is about 12909.9423313971. The cubic root of 166666611 is about 550.3211468800.

The spelling of 166666611 in words is "one hundred sixty-six million, six hundred sixty-six thousand, six hundred eleven".