664260505 has 8 divisors (see below), whose sum is σ = 799710912. Its totient is φ = 529676208.

The previous prime is 664260491. The next prime is 664260523. The reversal of 664260505 is 505062466.

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 664260505 - 2⁵ = 664260473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214837 + ... + 217906.

It is an arithmetic number, because the mean of its divisors is an integer number (99963864).

Almost surely, 2^664260505 is an apocalyptic number.

It is an amenable number.

664260505 is a deficient number, since it is larger than the sum of its proper divisors (135450407).

664260505 is a wasteful number, since it uses less digits than its factorization.

664260505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433055.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 664260505 is about 25773.2517350838. The cubic root of 664260505 is about 872.5282098579.

The spelling of 664260505 in words is "six hundred sixty-four million, two hundred sixty thousand, five hundred five".