668478280855 has 48 divisors (see below), whose sum is σ = 1077852907296. Its totient is φ = 392201134080.

The previous prime is 668478280837. The next prime is 668478280861. The reversal of 668478280855 is 558082874866.

It is not a de Polignac number, because 668478280855 - 2⁹ = 668478280343 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 7249594 + ... + 7341223.

It is an arithmetic number, because the mean of its divisors is an integer number (22455268902).

Almost surely, 2^668478280855 is an apocalyptic number.

668478280855 is a deficient number, since it is larger than the sum of its proper divisors (409374626441).

668478280855 is a wasteful number, since it uses less digits than its factorization.

668478280855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14590864 (or 14590857 counting only the distinct ones).

The product of its (nonzero) digits is 206438400, while the sum is 67.

The spelling of 668478280855 in words is "six hundred sixty-eight billion, four hundred seventy-eight million, two hundred eighty thousand, eight hundred fifty-five".