6561398224 has 20 divisors (see below), whose sum is σ = 12783735360. Its totient is φ = 3262369760.

The previous prime is 6561398203. The next prime is 6561398237. The reversal of 6561398224 is 4228931656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142632 + ... + 1148359.

It is an arithmetic number, because the mean of its divisors is an integer number (639186768).

Almost surely, 2^6561398224 is an apocalyptic number.

It is an amenable number.

6561398224 is a deficient number, since it is larger than the sum of its proper divisors (6222337136).

6561398224 is a wasteful number, since it uses less digits than its factorization.

6561398224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291178 (or 2291172 counting only the distinct ones).

The product of its digits is 622080, while the sum is 46.

The square root of 6561398224 is about 81002.4581355406. The cubic root of 6561398224 is about 1872.1133155772.

The spelling of 6561398224 in words is "six billion, five hundred sixty-one million, three hundred ninety-eight thousand, two hundred twenty-four".