66708885 has 16 divisors (see below), whose sum is σ = 108328896. Its totient is φ = 35046528.

The previous prime is 66708883. The next prime is 66708911. The reversal of 66708885 is 58880766.

It is a happy number.

It is not a de Polignac number, because 66708885 - 2¹ = 66708883 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32184 + ... + 34193.

It is an arithmetic number, because the mean of its divisors is an integer number (6770556).

Almost surely, 2^66708885 is an apocalyptic number.

It is an amenable number.

66708885 is a deficient number, since it is larger than the sum of its proper divisors (41620011).

66708885 is a wasteful number, since it uses less digits than its factorization.

66708885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66452.

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 66708885 is about 8167.5507344613. The cubic root of 66708885 is about 405.5657084536.

The spelling of 66708885 in words is "sixty-six million, seven hundred eight thousand, eight hundred eighty-five".