668549303 has 4 divisors (see below), whose sum is σ = 697616688. Its totient is φ = 639481920.

The previous prime is 668549279. The next prime is 668549309. The reversal of 668549303 is 303945866.

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

It is a cyclic number.

It is not a de Polignac number, because 668549303 - 2²⁰ = 667500727 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 (668549309) 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, 14533658 + ... + 14533703.

It is an arithmetic number, because the mean of its divisors is an integer number (174404172).

Almost surely, 2^668549303 is an apocalyptic number.

668549303 is a deficient number, since it is larger than the sum of its proper divisors (29067385).

668549303 is a wasteful number, since it uses less digits than its factorization.

668549303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29067384.

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 668549303 is about 25856.3203685289. The cubic root of 668549303 is about 874.4020090478.

The spelling of 668549303 in words is "six hundred sixty-eight million, five hundred forty-nine thousand, three hundred three".