6668140880749 has 2 divisors, whose sum is σ = 6668140880750. Its totient is φ = 6668140880748.

The previous prime is 6668140880729. The next prime is 6668140880887. The reversal of 6668140880749 is 9470880418666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6340777248100 + 327363632649 = 2518090^2 + 572157^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668140880749 - 2⁹ = 6668140880237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668140880729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334070440374 + 3334070440375.

It is an arithmetic number, because the mean of its divisors is an integer number (3334070440375).

Almost surely, 2^{6668140880749} is an apocalyptic number.

It is an amenable number.

6668140880749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668140880749 is an equidigital number, since it uses as much as digits as its factorization.

6668140880749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111476736, while the sum is 67.

The spelling of 6668140880749 in words is "six trillion, six hundred sixty-eight billion, one hundred forty million, eight hundred eighty thousand, seven hundred forty-nine".