66585566 has 16 divisors (see below), whose sum is σ = 109401840. Its totient is φ = 30253440.

The previous prime is 66585559. The next prime is 66585569. The reversal of 66585566 is 66558566.

It is a self number, because there is not a number n which added to its sum of digits gives 66585566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66585569) 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, 32780 + ... + 34751.

It is an arithmetic number, because the mean of its divisors is an integer number (6837615).

Almost surely, 2^66585566 is an apocalyptic number.

66585566 is a deficient number, since it is larger than the sum of its proper divisors (42816274).

66585566 is a wasteful number, since it uses less digits than its factorization.

66585566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67579.

The product of its digits is 1296000, while the sum is 47.

The square root of 66585566 is about 8159.9979166664. The cubic root of 66585566 is about 405.3156427733.

Subtracting from 66585566 its reverse (66558566), we obtain a cube (27000 = 30³).

The spelling of 66585566 in words is "sixty-six million, five hundred eighty-five thousand, five hundred sixty-six".