66580166 has 12 divisors (see below), whose sum is σ = 100652292. Its totient is φ = 33031404.

The previous prime is 66580141. The next prime is 66580181. The reversal of 66580166 is 66108566.

It is a super-3 number, since 3×66580166³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37781 + ... + 39503.

It is an arithmetic number, because the mean of its divisors is an integer number (8387691).

Almost surely, 2^66580166 is an apocalyptic number.

66580166 is a deficient number, since it is larger than the sum of its proper divisors (34072126).

66580166 is a wasteful number, since it uses less digits than its factorization.

66580166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003 (or 1864 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66580166 is about 8159.6670275202. The cubic root of 66580166 is about 405.3046856256.

The spelling of 66580166 in words is "sixty-six million, five hundred eighty thousand, one hundred sixty-six".