668868383749 has 4 divisors (see below), whose sum is σ = 674135064064. Its totient is φ = 663601703436.

The previous prime is 668868383747. The next prime is 668868383767. The reversal of 668868383749 is 947383868866.

668868383749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668868383749 - 2¹ = 668868383747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668868383747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2633339967 + ... + 2633340220.

It is an arithmetic number, because the mean of its divisors is an integer number (168533766016).

Almost surely, 2^668868383749 is an apocalyptic number.

It is an amenable number.

668868383749 is a deficient number, since it is larger than the sum of its proper divisors (5266680315).

668868383749 is a wasteful number, since it uses less digits than its factorization.

668868383749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266680314.

The product of its digits is 2006581248, while the sum is 76.

The spelling of 668868383749 in words is "six hundred sixty-eight billion, eight hundred sixty-eight million, three hundred eighty-three thousand, seven hundred forty-nine".