664663255 has 8 divisors (see below), whose sum is σ = 816144912. Its totient is φ = 519364608.

The previous prime is 664663217. The next prime is 664663271. The reversal of 664663255 is 552366466.

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

It is a cyclic number.

It is not a de Polignac number, because 664663255 - 2⁹ = 664662743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1545514 + ... + 1545943.

It is an arithmetic number, because the mean of its divisors is an integer number (102018114).

Almost surely, 2^664663255 is an apocalyptic number.

664663255 is a deficient number, since it is larger than the sum of its proper divisors (151481657).

664663255 is a wasteful number, since it uses less digits than its factorization.

664663255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091505.

The product of its digits is 777600, while the sum is 43.

The square root of 664663255 is about 25781.0638841767. The cubic root of 664663255 is about 872.7045160591.

The spelling of 664663255 in words is "six hundred sixty-four million, six hundred sixty-three thousand, two hundred fifty-five".