666643311421336 has 64 divisors (see below), whose sum is σ = 1326805762867200. Its totient is φ = 313608633811200.

The previous prime is 666643311421319. The next prime is 666643311421363. The reversal of 666643311421336 is 633124113346666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298039320 + ... + 300267751.

It is an arithmetic number, because the mean of its divisors is an integer number (20731340044800).

Almost surely, 2^{666643311421336} is an apocalyptic number.

It is an amenable number.

666643311421336 is a deficient number, since it is larger than the sum of its proper divisors (660162451445864).

666643311421336 is a wasteful number, since it uses less digits than its factorization.

666643311421336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598307240 (or 598307236 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 55.

The spelling of 666643311421336 in words is "six hundred sixty-six trillion, six hundred forty-three billion, three hundred eleven million, four hundred twenty-one thousand, three hundred thirty-six".