166655566 has 48 divisors (see below), whose sum is σ = 327532032. Its totient is φ = 62823600.

The previous prime is 166655563. The next prime is 166655581. The reversal of 166655566 is 665556661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166655563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30925 + ... + 35911.

It is an arithmetic number, because the mean of its divisors is an integer number (6823584).

Almost surely, 2^166655566 is an apocalyptic number.

166655566 is a deficient number, since it is larger than the sum of its proper divisors (160876466).

166655566 is a wasteful number, since it uses less digits than its factorization.

166655566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045 (or 5038 counting only the distinct ones).

The product of its digits is 972000, while the sum is 46.

The square root of 166655566 is about 12909.5145532278. The cubic root of 166655566 is about 550.3089900133.

The spelling of 166655566 in words is "one hundred sixty-six million, six hundred fifty-five thousand, five hundred sixty-six".