6521349925 has 6 divisors (see below), whose sum is σ = 8086473938. Its totient is φ = 5217079920.

The previous prime is 6521349911. The next prime is 6521349941. The reversal of 6521349925 is 5299431256.

It can be written as a sum of positive squares in 3 ways, for example, as 1571805316 + 4949544609 = 39646^2 + 70353^2 .

It is not a de Polignac number, because 6521349925 - 2²⁷ = 6387132197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130426974 + ... + 130427023.

Almost surely, 2^6521349925 is an apocalyptic number.

It is an amenable number.

6521349925 is a deficient number, since it is larger than the sum of its proper divisors (1565124013).

6521349925 is a wasteful number, since it uses less digits than its factorization.

6521349925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260854007 (or 260854002 counting only the distinct ones).

The product of its digits is 583200, while the sum is 46.

The square root of 6521349925 is about 80754.8755494057. The cubic root of 6521349925 is about 1868.2966487515.

The spelling of 6521349925 in words is "six billion, five hundred twenty-one million, three hundred forty-nine thousand, nine hundred twenty-five".