668536593 has 4 divisors (see below), whose sum is σ = 891382128. Its totient is φ = 445691060.

The previous prime is 668536579. The next prime is 668536597. The reversal of 668536593 is 395635866.

668536593 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668536593 - 2⁹ = 668536081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668536597) 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, 111422763 + ... + 111422768.

It is an arithmetic number, because the mean of its divisors is an integer number (222845532).

Almost surely, 2^668536593 is an apocalyptic number.

It is an amenable number.

668536593 is a deficient number, since it is larger than the sum of its proper divisors (222845535).

668536593 is a wasteful number, since it uses less digits than its factorization.

668536593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222845534.

The product of its digits is 3499200, while the sum is 51.

The square root of 668536593 is about 25856.0745860620. The cubic root of 668536593 is about 874.3964678360.

The spelling of 668536593 in words is "six hundred sixty-eight million, five hundred thirty-six thousand, five hundred ninety-three".