6516626561 has 8 divisors (see below), whose sum is σ = 6704495904. Its totient is φ = 6331422240.

The previous prime is 6516626503. The next prime is 6516626659. The reversal of 6516626561 is 1656266156.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6516626561 - 2¹⁸ = 6516364417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6516626461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661295 + ... + 671076.

It is an arithmetic number, because the mean of its divisors is an integer number (838061988).

Almost surely, 2^6516626561 is an apocalyptic number.

It is an amenable number.

6516626561 is a deficient number, since it is larger than the sum of its proper divisors (187869343).

6516626561 is a wasteful number, since it uses less digits than its factorization.

6516626561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332511.

The product of its digits is 388800, while the sum is 44.

The square root of 6516626561 is about 80725.6251818467. The cubic root of 6516626561 is about 1867.8454754703.

The spelling of 6516626561 in words is "six billion, five hundred sixteen million, six hundred twenty-six thousand, five hundred sixty-one".