6540442225 has 6 divisors (see below), whose sum is σ = 8110148390. Its totient is φ = 5232353760.

The previous prime is 6540442211. The next prime is 6540442229. The reversal of 6540442225 is 5222440456.

It can be written as a sum of positive squares in 3 ways, for example, as 19395216 + 6521047009 = 4404^2 + 80753^2 .

It is not a de Polignac number, because 6540442225 - 2¹¹ = 6540440177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6540442229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130808820 + ... + 130808869.

Almost surely, 2^6540442225 is an apocalyptic number.

It is an amenable number.

6540442225 is a deficient number, since it is larger than the sum of its proper divisors (1569706165).

6540442225 is a wasteful number, since it uses less digits than its factorization.

6540442225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261617699 (or 261617694 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 34.

The square root of 6540442225 is about 80873.0005935232. Note that the first 3 decimals coincide. The cubic root of 6540442225 is about 1870.1181185934.

The spelling of 6540442225 in words is "six billion, five hundred forty million, four hundred forty-two thousand, two hundred twenty-five".