6544123213 has 2 divisors, whose sum is σ = 6544123214. Its totient is φ = 6544123212.

The previous prime is 6544123211. The next prime is 6544123217. The reversal of 6544123213 is 3123214456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5426090244 + 1118032969 = 73662^2 + 33437^2 .

It is a cyclic number.

It is not a de Polignac number, because 6544123213 - 2¹ = 6544123211 is a prime.

Together with 6544123211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6544123211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272061606 + 3272061607.

It is an arithmetic number, because the mean of its divisors is an integer number (3272061607).

Almost surely, 2^6544123213 is an apocalyptic number.

It is an amenable number.

6544123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

6544123213 is an equidigital number, since it uses as much as digits as its factorization.

6544123213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 31.

The square root of 6544123213 is about 80895.7552223848. The cubic root of 6544123213 is about 1870.4688895400.

Adding to 6544123213 its reverse (3123214456), we get a palindrome (9667337669).

The spelling of 6544123213 in words is "six billion, five hundred forty-four million, one hundred twenty-three thousand, two hundred thirteen".