664260506 has 32 divisors (see below), whose sum is σ = 1227744000. Its totient is φ = 262480896.

The previous prime is 664260491. The next prime is 664260523. The reversal of 664260506 is 605062466.

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 15 ways as a sum of consecutive naturals, for example, 219995 + ... + 222993.

It is an arithmetic number, because the mean of its divisors is an integer number (38367000).

Almost surely, 2^664260506 is an apocalyptic number.

664260506 is a deficient number, since it is larger than the sum of its proper divisors (563483494).

664260506 is a wasteful number, since it uses less digits than its factorization.

664260506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4238.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 664260506 is about 25773.2517544838. The cubic root of 664260506 is about 872.5282102958.

The spelling of 664260506 in words is "six hundred sixty-four million, two hundred sixty thousand, five hundred six".