664020613 has 8 divisors (see below), whose sum is σ = 676771200. Its totient is φ = 651364560.

The previous prime is 664020593. The next prime is 664020619. The reversal of 664020613 is 316020466.

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 664020613 - 2⁹ = 664020101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664020619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9370 + ... + 37627.

It is an arithmetic number, because the mean of its divisors is an integer number (84596400).

Almost surely, 2^664020613 is an apocalyptic number.

It is an amenable number.

664020613 is a deficient number, since it is larger than the sum of its proper divisors (12750587).

664020613 is a wasteful number, since it uses less digits than its factorization.

664020613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47267.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 664020613 is about 25768.5974201158. The cubic root of 664020613 is about 872.4231618444.

The spelling of 664020613 in words is "six hundred sixty-four million, twenty thousand, six hundred thirteen".