668194303 has 4 divisors (see below), whose sum is σ = 763650640. Its totient is φ = 572737968.

The previous prime is 668194271. The next prime is 668194309. The reversal of 668194303 is 303491866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 303491866 = 2 ⋅151745933.

It is a cyclic number.

It is not a de Polignac number, because 668194303 - 2⁵ = 668194271 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 (668194309) 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, 47728158 + ... + 47728171.

It is an arithmetic number, because the mean of its divisors is an integer number (190912660).

Almost surely, 2^668194303 is an apocalyptic number.

668194303 is a deficient number, since it is larger than the sum of its proper divisors (95456337).

668194303 is an equidigital number, since it uses as much as digits as its factorization.

668194303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95456336.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 668194303 is about 25849.4545977280. The cubic root of 668194303 is about 874.2472123504.

The spelling of 668194303 in words is "six hundred sixty-eight million, one hundred ninety-four thousand, three hundred three".