664994163 has 8 divisors (see below), whose sum is σ = 889931776. Its totient is φ = 441693000.

The previous prime is 664994159. The next prime is 664994179. The reversal of 664994163 is 361499466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664994163 - 2² = 664994159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664994663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408163 + ... + 409788.

It is an arithmetic number, because the mean of its divisors is an integer number (111241472).

Almost surely, 2^664994163 is an apocalyptic number.

664994163 is a deficient number, since it is larger than the sum of its proper divisors (224937613).

664994163 is a wasteful number, since it uses less digits than its factorization.

664994163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818225.

The product of its digits is 839808, while the sum is 48.

The square root of 664994163 is about 25787.4807416312. The cubic root of 664994163 is about 872.8493197084.

The spelling of 664994163 in words is "six hundred sixty-four million, nine hundred ninety-four thousand, one hundred sixty-three".