668748847866 has 32 divisors (see below), whose sum is σ = 1459182513600. Its totient is φ = 202638094080.

The previous prime is 668748847777. The next prime is 668748847901.

668748847866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 668748847791 and 668748847800.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 729820 + ... + 1367528.

It is an arithmetic number, because the mean of its divisors is an integer number (45599453550).

Almost surely, 2^668748847866 is an apocalyptic number.

668748847866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

668748847866 is an abundant number, since it is smaller than the sum of its proper divisors (790433665734).

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

668748847866 is a wasteful number, since it uses less digits than its factorization.

668748847866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653614.

The product of its digits is 4161798144, while the sum is 78.

The spelling of 668748847866 in words is "six hundred sixty-eight billion, seven hundred forty-eight million, eight hundred forty-seven thousand, eight hundred sixty-six".