664858785 has 32 divisors (see below), whose sum is σ = 1102631040. Its totient is φ = 341687808.

The previous prime is 664858783. The next prime is 664858807. The reversal of 664858785 is 587858466.

It is a happy number.

It is not a de Polignac number, because 664858785 - 2¹ = 664858783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664858781) 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 31 ways as a sum of consecutive naturals, for example, 278517 + ... + 280893.

It is an arithmetic number, because the mean of its divisors is an integer number (34457220).

Almost surely, 2^664858785 is an apocalyptic number.

It is an amenable number.

664858785 is a deficient number, since it is larger than the sum of its proper divisors (437772255).

664858785 is a wasteful number, since it uses less digits than its factorization.

664858785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057.

The product of its digits is 12902400, while the sum is 57.

The square root of 664858785 is about 25784.8557296720. The cubic root of 664858785 is about 872.7900847952.

The spelling of 664858785 in words is "six hundred sixty-four million, eight hundred fifty-eight thousand, seven hundred eighty-five".