6644626543 has 2 divisors, whose sum is σ = 6644626544. Its totient is φ = 6644626542.

The previous prime is 6644626453. The next prime is 6644626559. The reversal of 6644626543 is 3456264466.

It is a happy number.

Together with previous prime (6644626453) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6644626543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6644626493 and 6644626502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6644626343) 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, 3322313271 + 3322313272.

It is an arithmetic number, because the mean of its divisors is an integer number (3322313272).

Almost surely, 2^6644626543 is an apocalyptic number.

6644626543 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644626543 is an equidigital number, since it uses as much as digits as its factorization.

6644626543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 46.

The square root of 6644626543 is about 81514.5787144852. The cubic root of 6644626543 is about 1879.9957128882.

The spelling of 6644626543 in words is "six billion, six hundred forty-four million, six hundred twenty-six thousand, five hundred forty-three".