668732293 has 4 divisors (see below), whose sum is σ = 678713440. Its totient is φ = 658751148.

The previous prime is 668732287. The next prime is 668732321. The reversal of 668732293 is 392237866.

668732293 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, and also an emirpimes, since its reverse is a distinct semiprime: 392237866 = 2 ⋅196118933.

It is a cyclic number.

It is not a de Polignac number, because 668732293 - 2⁵ = 668732261 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 (668732243) 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, 4990473 + ... + 4990606.

It is an arithmetic number, because the mean of its divisors is an integer number (169678360).

Almost surely, 2^668732293 is an apocalyptic number.

It is an amenable number.

668732293 is a deficient number, since it is larger than the sum of its proper divisors (9981147).

668732293 is an equidigital number, since it uses as much as digits as its factorization.

668732293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9981146.

The product of its digits is 653184, while the sum is 46.

The square root of 668732293 is about 25859.8587196450. The cubic root of 668732293 is about 874.4817798922.

The spelling of 668732293 in words is "six hundred sixty-eight million, seven hundred thirty-two thousand, two hundred ninety-three".