668754686668 has 24 divisors (see below), whose sum is σ = 1230866824320. Its totient is φ = 317485484160.

The previous prime is 668754686657. The next prime is 668754686693. The reversal of 668754686668 is 866686457866.

It is a junction number, because it is equal to n+sod(n) for n = 668754686594 and 668754686603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50872513 + ... + 50885656.

It is an arithmetic number, because the mean of its divisors is an integer number (51286117680).

Almost surely, 2^668754686668 is an apocalyptic number.

It is an amenable number.

668754686668 is a deficient number, since it is larger than the sum of its proper divisors (562112137652).

668754686668 is a wasteful number, since it uses less digits than its factorization.

668754686668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101758257 (or 101758255 counting only the distinct ones).

The product of its digits is 3344302080, while the sum is 76.

The spelling of 668754686668 in words is "six hundred sixty-eight billion, seven hundred fifty-four million, six hundred eighty-six thousand, six hundred sixty-eight".