6516561471 has 16 divisors (see below), whose sum is σ = 10198377984. Its totient is φ = 3623107104.

The previous prime is 6516561419. The next prime is 6516561479. The reversal of 6516561471 is 1741656156.

It is a happy number.

It is not a de Polignac number, because 6516561471 - 2⁶ = 6516561407 is a prime.

It is a super-3 number, since 3×6516561471³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6516561479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4192635 + ... + 4194188.

It is an arithmetic number, because the mean of its divisors is an integer number (637398624).

Almost surely, 2^6516561471 is an apocalyptic number.

6516561471 is a deficient number, since it is larger than the sum of its proper divisors (3681816513).

6516561471 is a wasteful number, since it uses less digits than its factorization.

6516561471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8386870.

The product of its digits is 151200, while the sum is 42.

The square root of 6516561471 is about 80725.2220250895. Note that the first 3 decimals coincide. The cubic root of 6516561471 is about 1867.8392565846.

The spelling of 6516561471 in words is "six billion, five hundred sixteen million, five hundred sixty-one thousand, four hundred seventy-one".