6671561443 has 2 divisors, whose sum is σ = 6671561444. Its totient is φ = 6671561442.

The previous prime is 6671561419. The next prime is 6671561453. The reversal of 6671561443 is 3441651766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6671561443 - 2²⁵ = 6638007011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6671561443.

It is not a weakly prime, because it can be changed into another prime (6671561453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335780721 + 3335780722.

It is an arithmetic number, because the mean of its divisors is an integer number (3335780722).

Almost surely, 2^6671561443 is an apocalyptic number.

6671561443 is a deficient number, since it is larger than the sum of its proper divisors (1).

6671561443 is an equidigital number, since it uses as much as digits as its factorization.

6671561443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 43.

The square root of 6671561443 is about 81679.6268539469. The cubic root of 6671561443 is about 1882.5325611657.

The spelling of 6671561443 in words is "six billion, six hundred seventy-one million, five hundred sixty-one thousand, four hundred forty-three".