6518140225 has 27 divisors (see below), whose sum is σ = 8239115241. Its totient is φ = 5115369600.

The previous prime is 6518140219. The next prime is 6518140229. The reversal of 6518140225 is 5220418156.

It is a happy number.

The square root of 6518140225 is 80735.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 97002801 + 6421137424 = 9849^2 + 80132^2 .

It is not a de Polignac number, because 6518140225 - 2³ = 6518140217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6518140229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 27046105 + ... + 27046345.

Almost surely, 2^6518140225 is an apocalyptic number.

6518140225 is the 80735-th square number.

6518140225 is the 40368-th centered octagonal number.

It is an amenable number.

6518140225 is a deficient number, since it is larger than the sum of its proper divisors (1720975016).

6518140225 is an frugal number, since it uses more digits than its factorization.

6518140225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The cubic root of 6518140225 is about 1867.9900836020.

The spelling of 6518140225 in words is "six billion, five hundred eighteen million, one hundred forty thousand, two hundred twenty-five".