668730037866 has 128 divisors (see below), whose sum is σ = 1528719298560. Its totient is φ = 193253433600.

The previous prime is 668730037853. The next prime is 668730037907.

668730037866 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20230240 + ... + 20263268.

It is an arithmetic number, because the mean of its divisors is an integer number (11943119520).

Almost surely, 2^668730037866 is an apocalyptic number.

668730037866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 668730037866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764359649280).

668730037866 is an abundant number, since it is smaller than the sum of its proper divisors (859989260694).

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

668730037866 is a wasteful number, since it uses less digits than its factorization.

668730037866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33260.

The product of its (nonzero) digits is 36578304, while the sum is 60.

The spelling of 668730037866 in words is "six hundred sixty-eight billion, seven hundred thirty million, thirty-seven thousand, eight hundred sixty-six".