668605850 has 24 divisors (see below), whose sum is σ = 1356663168. Its totient is φ = 243129200.

The previous prime is 668605841. The next prime is 668605853. The reversal of 668605850 is 58506866.

It is not an unprimeable number, because it can be changed into a prime (668605853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 607274 + ... + 608373.

It is an arithmetic number, because the mean of its divisors is an integer number (56527632).

Almost surely, 2^668605850 is an apocalyptic number.

668605850 is an abundant number, since it is smaller than the sum of its proper divisors (688057318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668605850 is a wasteful number, since it uses less digits than its factorization.

668605850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215670 (or 1215665 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 668605850 is about 25857.4138304665. The cubic root of 668605850 is about 874.4266611397.

The spelling of 668605850 in words is "six hundred sixty-eight million, six hundred five thousand, eight hundred fifty".