664664361 has 16 divisors (see below), whose sum is σ = 905857344. Its totient is φ = 433344704.

The previous prime is 664664339. The next prime is 664664417. The reversal of 664664361 is 163466466.

It is a cyclic number.

It is not a de Polignac number, because 664664361 - 2⁹ = 664663849 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (664660361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43810 + ... + 56996.

It is an arithmetic number, because the mean of its divisors is an integer number (56616084).

Almost surely, 2^664664361 is an apocalyptic number.

It is an amenable number.

664664361 is a deficient number, since it is larger than the sum of its proper divisors (241192983).

664664361 is a wasteful number, since it uses less digits than its factorization.

664664361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13560.

The product of its digits is 373248, while the sum is 42.

The square root of 664664361 is about 25781.0853340196. The cubic root of 664664361 is about 872.7050001191.

The spelling of 664664361 in words is "six hundred sixty-four million, six hundred sixty-four thousand, three hundred sixty-one".