6521256225 has 72 divisors (see below), whose sum is σ = 12757870944. Its totient is φ = 3157920000.

The previous prime is 6521256223. The next prime is 6521256233. The reversal of 6521256225 is 5226521256.

6521256225 is a `hidden beast` number, since 6 + 5 + 2 + 1 + 25 + 622 + 5 = 666.

It is not a de Polignac number, because 6521256225 - 2¹ = 6521256223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6521256225.

It is not an unprimeable number, because it can be changed into a prime (6521256223) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3788365 + ... + 3790085.

It is an arithmetic number, because the mean of its divisors is an integer number (177192652).

Almost surely, 2^6521256225 is an apocalyptic number.

It is an amenable number.

6521256225 is a deficient number, since it is larger than the sum of its proper divisors (6236614719).

6521256225 is a wasteful number, since it uses less digits than its factorization.

6521256225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279 (or 3271 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 6521256225 is about 80754.2953965918. The cubic root of 6521256225 is about 1868.2877006944.

The spelling of 6521256225 in words is "six billion, five hundred twenty-one million, two hundred fifty-six thousand, two hundred twenty-five".