66670785 has 12 divisors (see below), whose sum is σ = 115562772. Its totient is φ = 35557728.

The previous prime is 66670777. The next prime is 66670789. The reversal of 66670785 is 58707666.

66670785 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 52359696 + 14311089 = 7236^2 + 3783^2 .

It is not a de Polignac number, because 66670785 - 2³ = 66670777 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1481573 = 66670785 / (6 + 6 + 6 + 7 + 0 + 7 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 66670785.

It is not an unprimeable number, because it can be changed into a prime (66670789) by changing a digit.

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, 740742 + ... + 740831.

It is an arithmetic number, because the mean of its divisors is an integer number (9630231).

Almost surely, 2^66670785 is an apocalyptic number.

It is an amenable number.

66670785 is a deficient number, since it is larger than the sum of its proper divisors (48891987).

66670785 is a wasteful number, since it uses less digits than its factorization.

66670785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481584 (or 1481581 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 66670785 is about 8165.2180007640. The cubic root of 66670785 is about 405.4884823780.

The spelling of 66670785 in words is "sixty-six million, six hundred seventy thousand, seven hundred eighty-five".