6413563521 has 12 divisors (see below), whose sum is σ = 9353979648. Its totient is φ = 4234196664.

The previous prime is 6413563517. The next prime is 6413563523. The reversal of 6413563521 is 1253653146.

6413563521 is a `hidden beast` number, since 6 + 4 + 13 + 5 + 635 + 2 + 1 = 666.

It is not a de Polignac number, because 6413563521 - 2² = 6413563517 is a prime.

It is a super-2 number, since 2×6413563521² = 82267594075803834882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6413563523) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3458385 + ... + 3460238.

It is an arithmetic number, because the mean of its divisors is an integer number (779498304).

Almost surely, 2^6413563521 is an apocalyptic number.

It is an amenable number.

6413563521 is a deficient number, since it is larger than the sum of its proper divisors (2940416127).

6413563521 is a wasteful number, since it uses less digits than its factorization.

6413563521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6918732 (or 6918729 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 6413563521 is about 80084.7271394490. The cubic root of 6413563521 is about 1857.9461973094.

The spelling of 6413563521 in words is "six billion, four hundred thirteen million, five hundred sixty-three thousand, five hundred twenty-one".