6669561341 has 2 divisors, whose sum is σ = 6669561342. Its totient is φ = 6669561340.

The previous prime is 6669561319. The next prime is 6669561373. The reversal of 6669561341 is 1431659666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5744124100 + 925437241 = 75790^2 + 30421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6669561341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6669561541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334780670 + 3334780671.

It is an arithmetic number, because the mean of its divisors is an integer number (3334780671).

Almost surely, 2^6669561341 is an apocalyptic number.

It is an amenable number.

6669561341 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669561341 is an equidigital number, since it uses as much as digits as its factorization.

6669561341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 47.

The square root of 6669561341 is about 81667.3823567280. The cubic root of 6669561341 is about 1882.3444176302.

The spelling of 6669561341 in words is "six billion, six hundred sixty-nine million, five hundred sixty-one thousand, three hundred forty-one".