6443515225 has 12 divisors (see below), whose sum is σ = 9131381824. Its totient is φ = 4418410320.

The previous prime is 6443515207. The next prime is 6443515229. The reversal of 6443515225 is 5225153446.

It is not a de Polignac number, because 6443515225 - 2⁹ = 6443514713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6443515229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18409869 + ... + 18410218.

Almost surely, 2^6443515225 is an apocalyptic number.

It is an amenable number.

6443515225 is a deficient number, since it is larger than the sum of its proper divisors (2687866599).

6443515225 is a wasteful number, since it uses less digits than its factorization.

6443515225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36820104 (or 36820099 counting only the distinct ones).

The product of its digits is 144000, while the sum is 37.

The square root of 6443515225 is about 80271.5094227086. The cubic root of 6443515225 is about 1860.8339445537.

The spelling of 6443515225 in words is "six billion, four hundred forty-three million, five hundred fifteen thousand, two hundred twenty-five".