664193085 has 32 divisors (see below), whose sum is σ = 1085685120. Its totient is φ = 346614528.

The previous prime is 664193083. The next prime is 664193099. The reversal of 664193085 is 580391466.

It is not a de Polignac number, because 664193085 - 2¹ = 664193083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664193083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 370371 + ... + 372159.

It is an arithmetic number, because the mean of its divisors is an integer number (33927660).

Almost surely, 2^664193085 is an apocalyptic number.

It is an amenable number.

664193085 is a deficient number, since it is larger than the sum of its proper divisors (421492035).

664193085 is a wasteful number, since it uses less digits than its factorization.

664193085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 664193085 is about 25771.9437567289. The cubic root of 664193085 is about 872.4986893903.

The spelling of 664193085 in words is "six hundred sixty-four million, one hundred ninety-three thousand, eighty-five".