6544143225 has 24 divisors (see below), whose sum is σ = 12021834720. Its totient is φ = 3490209360.

The previous prime is 6544143169. The next prime is 6544143227. The reversal of 6544143225 is 5223414456.

It is not a de Polignac number, because 6544143225 - 2¹⁰ = 6544142201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6544143225.

It is not an unprimeable number, because it can be changed into a prime (6544143227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4846839 + ... + 4848188.

It is an arithmetic number, because the mean of its divisors is an integer number (500909780).

Almost surely, 2^6544143225 is an apocalyptic number.

It is an amenable number.

6544143225 is a deficient number, since it is larger than the sum of its proper divisors (5477691495).

6544143225 is a wasteful number, since it uses less digits than its factorization.

6544143225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695046 (or 9695035 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 6544143225 is about 80895.8789123402. The cubic root of 6544143225 is about 1870.4707961761.

It can be divided in two parts, 6544 and 143225, that added together give a square (149769 = 387²).

The spelling of 6544143225 in words is "six billion, five hundred forty-four million, one hundred forty-three thousand, two hundred twenty-five".