668605915390 has 16 divisors (see below), whose sum is σ = 1375417883232. Its totient is φ = 229236313824.

The previous prime is 668605915379. The next prime is 668605915489. The reversal of 668605915390 is 93519506866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4775756469 + ... + 4775756608.

It is an arithmetic number, because the mean of its divisors is an integer number (85963617702).

Almost surely, 2^668605915390 is an apocalyptic number.

668605915390 is an abundant number, since it is smaller than the sum of its proper divisors (706811967842).

668605915390 is a wasteful number, since it uses less digits than its factorization.

668605915390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9551513091.

The product of its (nonzero) digits is 10497600, while the sum is 58.

The spelling of 668605915390 in words is "six hundred sixty-eight billion, six hundred five million, nine hundred fifteen thousand, three hundred ninety".