668698896866 has 64 divisors (see below), whose sum is σ = 1348887085056. Its totient is φ = 240109531200.

The previous prime is 668698896773. The next prime is 668698896869.

668698896866 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (668698896869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 998591 + ... + 1527933.

It is an arithmetic number, because the mean of its divisors is an integer number (21076360704).

Almost surely, 2^668698896866 is an apocalyptic number.

668698896866 is an abundant number, since it is smaller than the sum of its proper divisors (680188188190).

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

668698896866 is a wasteful number, since it uses less digits than its factorization.

668698896866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530007.

The product of its digits is 15479341056, while the sum is 86.

The spelling of 668698896866 in words is "six hundred sixty-eight billion, six hundred ninety-eight million, eight hundred ninety-six thousand, eight hundred sixty-six".