668361878760 has 256 divisors, whose sum is σ = 2110771353600. Its totient is φ = 168976862208.

The previous prime is 668361878747. The next prime is 668361878797. The reversal of 668361878760 is 67878163866.

It is a junction number, because it is equal to n+sod(n) for n = 668361878691 and 668361878700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 338753134 + ... + 338755106.

It is an arithmetic number, because the mean of its divisors is an integer number (8245200600).

Almost surely, 2^668361878760 is an apocalyptic number.

668361878760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668361878760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055385676800).

668361878760 is an abundant number, since it is smaller than the sum of its proper divisors (1442409474840).

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

668361878760 is a wasteful number, since it uses less digits than its factorization.

668361878760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032 (or 3028 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 66.

The spelling of 668361878760 in words is "six hundred sixty-eight billion, three hundred sixty-one million, eight hundred seventy-eight thousand, seven hundred sixty".