66880785 has 16 divisors (see below), whose sum is σ = 107285760. Its totient is φ = 35577600.

The previous prime is 66880739. The next prime is 66880811. The reversal of 66880785 is 58708866.

It is a happy number.

66880785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66880785 - 2¹⁷ = 66749713 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456 + ... + 11574.

It is an arithmetic number, because the mean of its divisors is an integer number (6705360).

Almost surely, 2^66880785 is an apocalyptic number.

It is an amenable number.

66880785 is a deficient number, since it is larger than the sum of its proper divisors (40404975).

66880785 is a wasteful number, since it uses less digits than its factorization.

66880785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11528.

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

The square root of 66880785 is about 8178.0673144698. The cubic root of 66880785 is about 405.9137727694.

The spelling of 66880785 in words is "sixty-six million, eight hundred eighty thousand, seven hundred eighty-five".