66662785 has 12 divisors (see below), whose sum is σ = 93056148. Its totient is φ = 45711456.

The previous prime is 66662777. The next prime is 66662801. The reversal of 66662785 is 58726666.

66662785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 18054001 + 48608784 = 4249^2 + 6972^2 .

It is not a de Polignac number, because 66662785 - 2³ = 66662777 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 135802 + ... + 136291.

It is an arithmetic number, because the mean of its divisors is an integer number (7754679).

Almost surely, 2^66662785 is an apocalyptic number.

It is an amenable number.

66662785 is a deficient number, since it is larger than the sum of its proper divisors (26393363).

66662785 is a wasteful number, since it uses less digits than its factorization.

66662785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272112 (or 272105 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The square root of 66662785 is about 8164.7281032500. The cubic root of 66662785 is about 405.4722631919.

The spelling of 66662785 in words is "sixty-six million, six hundred sixty-two thousand, seven hundred eighty-five".