6544689841 has 2 divisors, whose sum is σ = 6544689842. Its totient is φ = 6544689840.

The previous prime is 6544689799. The next prime is 6544689847. The reversal of 6544689841 is 1489864456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6003150400 + 541539441 = 77480^2 + 23271^2 .

It is a cyclic number.

It is not a de Polignac number, because 6544689841 - 2¹⁵ = 6544657073 is a prime.

It is a super-2 number, since 2×6544689841² = 85665930229777210562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6544689847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272344920 + 3272344921.

It is an arithmetic number, because the mean of its divisors is an integer number (3272344921).

Almost surely, 2^6544689841 is an apocalyptic number.

It is an amenable number.

6544689841 is a deficient number, since it is larger than the sum of its proper divisors (1).

6544689841 is an equidigital number, since it uses as much as digits as its factorization.

6544689841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6635520, while the sum is 55.

The square root of 6544689841 is about 80899.2573575308. The cubic root of 6544689841 is about 1870.5228733166.

The spelling of 6544689841 in words is "six billion, five hundred forty-four million, six hundred eighty-nine thousand, eight hundred forty-one".