664640163 has 48 divisors (see below), whose sum is σ = 1066871520. Its totient is φ = 395366400.

The previous prime is 664640153. The next prime is 664640167. The reversal of 664640163 is 361046466.

664640163 is a `hidden beast` number, since 6 + 6 + 4 + 640 + 1 + 6 + 3 = 666.

It is not a de Polignac number, because 664640163 - 2¹² = 664636067 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (664640167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2123295 + ... + 2123607.

It is an arithmetic number, because the mean of its divisors is an integer number (22226490).

Almost surely, 2^664640163 is an apocalyptic number.

664640163 is a deficient number, since it is larger than the sum of its proper divisors (402231357).

664640163 is a wasteful number, since it uses less digits than its factorization.

664640163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 664640163 is about 25780.6160322053. The cubic root of 664640163 is about 872.6944093242.

The spelling of 664640163 in words is "six hundred sixty-four million, six hundred forty thousand, one hundred sixty-three".