659397643 has 4 divisors (see below), whose sum is σ = 659672208. Its totient is φ = 659123080.

The previous prime is 659397623. The next prime is 659397659. The reversal of 659397643 is 346793956.

659397643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-659397643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (659397623) 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, 133648 + ... + 138493.

It is an arithmetic number, because the mean of its divisors is an integer number (164918052).

Almost surely, 2^659397643 is an apocalyptic number.

659397643 is a deficient number, since it is larger than the sum of its proper divisors (274565).

659397643 is a wasteful number, since it uses less digits than its factorization.

659397643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274564.

The product of its digits is 3674160, while the sum is 52.

The square root of 659397643 is about 25678.7391240302. The cubic root of 659397643 is about 870.3938160704.

The spelling of 659397643 in words is "six hundred fifty-nine million, three hundred ninety-seven thousand, six hundred forty-three".