664406163 has 12 divisors (see below), whose sum is σ = 959933520. Its totient is φ = 442828656.

The previous prime is 664406159. The next prime is 664406177. The reversal of 664406163 is 361604466.

664406163 is a `hidden beast` number, since 6 + 644 + 0 + 6 + 1 + 6 + 3 = 666.

It is not a de Polignac number, because 664406163 - 2² = 664406159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664406263) 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, 49578 + ... + 61536.

It is an arithmetic number, because the mean of its divisors is an integer number (79994460).

Almost surely, 2^664406163 is an apocalyptic number.

664406163 is a deficient number, since it is larger than the sum of its proper divisors (295527357).

664406163 is a wasteful number, since it uses less digits than its factorization.

664406163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18138 (or 18135 counting only the distinct ones).

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

The square root of 664406163 is about 25776.0773392694. The cubic root of 664406163 is about 872.5919807353.

The spelling of 664406163 in words is "six hundred sixty-four million, four hundred six thousand, one hundred sixty-three".