6521523551 has 4 divisors (see below), whose sum is σ = 6537787104. Its totient is φ = 6505260000.

The previous prime is 6521523529. The next prime is 6521523557. The reversal of 6521523551 is 1553251256.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6521523551 - 2³⁰ = 5447781727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521523557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8131175 + ... + 8131976.

It is an arithmetic number, because the mean of its divisors is an integer number (1634446776).

Almost surely, 2^6521523551 is an apocalyptic number.

6521523551 is a deficient number, since it is larger than the sum of its proper divisors (16263553).

6521523551 is a wasteful number, since it uses less digits than its factorization.

6521523551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16263552.

The product of its digits is 45000, while the sum is 35.

The square root of 6521523551 is about 80755.9505609339. The cubic root of 6521523551 is about 1868.3132292652.

The spelling of 6521523551 in words is "six billion, five hundred twenty-one million, five hundred twenty-three thousand, five hundred fifty-one".