6668146789 has 2 divisors, whose sum is σ = 6668146790. Its totient is φ = 6668146788.

The previous prime is 6668146769. The next prime is 6668146799. The reversal of 6668146789 is 9876418666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6661334689 + 6812100 = 81617^2 + 2610^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668146789 - 2¹⁹ = 6667622501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668146739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334073394 + 3334073395.

It is an arithmetic number, because the mean of its divisors is an integer number (3334073395).

Almost surely, 2^6668146789 is an apocalyptic number.

It is an amenable number.

6668146789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668146789 is an equidigital number, since it uses as much as digits as its factorization.

6668146789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 61.

The square root of 6668146789 is about 81658.7214509265. The cubic root of 6668146789 is about 1882.2113322997.

The spelling of 6668146789 in words is "six billion, six hundred sixty-eight million, one hundred forty-six thousand, seven hundred eighty-nine".