6561546653 has 2 divisors, whose sum is σ = 6561546654. Its totient is φ = 6561546652.

The previous prime is 6561546623. The next prime is 6561546671. The reversal of 6561546653 is 3566451656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6531549124 + 29997529 = 80818^2 + 5477^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561546653 - 2²⁴ = 6544769437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6561546598 and 6561546607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6561546613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280773326 + 3280773327.

It is an arithmetic number, because the mean of its divisors is an integer number (3280773327).

Almost surely, 2^6561546653 is an apocalyptic number.

It is an amenable number.

6561546653 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561546653 is an equidigital number, since it uses as much as digits as its factorization.

6561546653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944000, while the sum is 47.

The square root of 6561546653 is about 81003.3743309499. The cubic root of 6561546653 is about 1872.1274321726.

The spelling of 6561546653 in words is "six billion, five hundred sixty-one million, five hundred forty-six thousand, six hundred fifty-three".