659644013 has 32 divisors (see below), whose sum is σ = 829440000. Its totient is φ = 511743744.

The previous prime is 659643997. The next prime is 659644019. The reversal of 659644013 is 310446956.

It is a cyclic number.

It is not a de Polignac number, because 659644013 - 2⁴ = 659643997 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 (659644019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328988 + ... + 330986.

It is an arithmetic number, because the mean of its divisors is an integer number (25920000).

Almost surely, 2^659644013 is an apocalyptic number.

It is an amenable number.

659644013 is a deficient number, since it is larger than the sum of its proper divisors (169795987).

659644013 is a wasteful number, since it uses less digits than its factorization.

659644013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 659644013 is about 25683.5358352389. The cubic root of 659644013 is about 870.5022039936.

The spelling of 659644013 in words is "six hundred fifty-nine million, six hundred forty-four thousand, thirteen".