66708866 has 16 divisors (see below), whose sum is σ = 114597504. Its totient is φ = 28529664.

The previous prime is 66708853. The next prime is 66708871. The reversal of 66708866 is 66880766.

It is a self number, because there is not a number n which added to its sum of digits gives 66708866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2306 + ... + 11778.

It is an arithmetic number, because the mean of its divisors is an integer number (7162344).

Almost surely, 2^66708866 is an apocalyptic number.

66708866 is a deficient number, since it is larger than the sum of its proper divisors (47888638).

66708866 is a wasteful number, since it uses less digits than its factorization.

66708866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9985.

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 66708866 is about 8167.5495713219. The cubic root of 66708866 is about 405.5656699492.

The spelling of 66708866 in words is "sixty-six million, seven hundred eight thousand, eight hundred sixty-six".