659643213 has 4 divisors (see below), whose sum is σ = 879524288. Its totient is φ = 439762140.

The previous prime is 659643211. The next prime is 659643217. The reversal of 659643213 is 312346956.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 659643213 - 2¹ = 659643211 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 (659643211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109940533 + ... + 109940538.

It is an arithmetic number, because the mean of its divisors is an integer number (219881072).

Almost surely, 2^659643213 is an apocalyptic number.

It is an amenable number.

659643213 is a deficient number, since it is larger than the sum of its proper divisors (219881075).

659643213 is a wasteful number, since it uses less digits than its factorization.

659643213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219881074.

The product of its digits is 116640, while the sum is 39.

The square root of 659643213 is about 25683.5202610546. The cubic root of 659643213 is about 870.5018520856.

The spelling of 659643213 in words is "six hundred fifty-nine million, six hundred forty-three thousand, two hundred thirteen".