6669561343 has 4 divisors (see below), whose sum is σ = 6731893800. Its totient is φ = 6607228888.

The previous prime is 6669561341. The next prime is 6669561373. The reversal of 6669561343 is 3431659666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3431659666 = 2 ⋅1715829833.

It is a cyclic number.

It is not a de Polignac number, because 6669561343 - 2¹ = 6669561341 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 (6669561341) 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, 31166068 + ... + 31166281.

It is an arithmetic number, because the mean of its divisors is an integer number (1682973450).

Almost surely, 2^6669561343 is an apocalyptic number.

6669561343 is a deficient number, since it is larger than the sum of its proper divisors (62332457).

6669561343 is a wasteful number, since it uses less digits than its factorization.

6669561343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62332456.

The product of its digits is 2099520, while the sum is 49.

The square root of 6669561343 is about 81667.3823689727. The cubic root of 6669561343 is about 1882.3444178183.

The spelling of 6669561343 in words is "six billion, six hundred sixty-nine million, five hundred sixty-one thousand, three hundred forty-three".