668522318 has 4 divisors (see below), whose sum is σ = 1002783480. Its totient is φ = 334261158.

The previous prime is 668522317. The next prime is 668522341. The reversal of 668522318 is 813225866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668522317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167130578 + ... + 167130581.

It is an arithmetic number, because the mean of its divisors is an integer number (250695870).

Almost surely, 2^668522318 is an apocalyptic number.

668522318 is a deficient number, since it is larger than the sum of its proper divisors (334261162).

668522318 is a wasteful number, since it uses less digits than its factorization.

668522318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334261161.

The product of its digits is 138240, while the sum is 41.

The square root of 668522318 is about 25855.7985372721. The cubic root of 668522318 is about 874.3902442433.

The spelling of 668522318 in words is "six hundred sixty-eight million, five hundred twenty-two thousand, three hundred eighteen".