6669561373 has 2 divisors, whose sum is σ = 6669561374. Its totient is φ = 6669561372.

The previous prime is 6669561341. The next prime is 6669561383. The reversal of 6669561373 is 3731659666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4674867129 + 1994694244 = 68373^2 + 44662^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669561373 - 2⁵ = 6669561341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6669561373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6669561383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334780686 + 3334780687.

It is an arithmetic number, because the mean of its divisors is an integer number (3334780687).

Almost surely, 2^6669561373 is an apocalyptic number.

It is an amenable number.

6669561373 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669561373 is an equidigital number, since it uses as much as digits as its factorization.

6669561373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 52.

The square root of 6669561373 is about 81667.3825526446. The cubic root of 6669561373 is about 1882.3444206406.

The spelling of 6669561373 in words is "six billion, six hundred sixty-nine million, five hundred sixty-one thousand, three hundred seventy-three".