6661166 has 4 divisors (see below), whose sum is σ = 9991752. Its totient is φ = 3330582.

The previous prime is 6661157. The next prime is 6661189. The reversal of 6661166 is 6611666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6611666 = 2 ⋅3305833.

It is a super-2 number, since 2×6661166² = 88742264959112, which contains 22 as substring.

It is an Ulam number.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665290 + ... + 1665293.

It is an arithmetic number, because the mean of its divisors is an integer number (2497938).

Almost surely, 2^6661166 is an apocalyptic number.

6661166 is a deficient number, since it is larger than the sum of its proper divisors (3330586).

6661166 is a wasteful number, since it uses less digits than its factorization.

6661166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330585.

The product of its digits is 7776, while the sum is 32.

The square root of 6661166 is about 2580.9234781372. The cubic root of 6661166 is about 188.1554282779.

The spelling of 6661166 in words is "six million, six hundred sixty-one thousand, one hundred sixty-six".