668487784866 has 32 divisors (see below), whose sum is σ = 1466949572928. Its totient is φ = 201401115840.

The previous prime is 668487784859. The next prime is 668487784889.

668487784866 is nontrivially palindromic in base 10.

668487784866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 668487784791 and 668487784800.

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, 29262001 + ... + 29284836.

It is an arithmetic number, because the mean of its divisors is an integer number (45842174154).

Almost surely, 2^668487784866 is an apocalyptic number.

668487784866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

668487784866 is an abundant number, since it is smaller than the sum of its proper divisors (798461788062).

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

668487784866 is a wasteful number, since it uses less digits than its factorization.

668487784866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58547026.

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

The spelling of 668487784866 in words is "six hundred sixty-eight billion, four hundred eighty-seven million, seven hundred eighty-four thousand, eight hundred sixty-six".