6561768812953 has 2 divisors, whose sum is σ = 6561768812954. Its totient is φ = 6561768812952.

The previous prime is 6561768812933. The next prime is 6561768812957. The reversal of 6561768812953 is 3592188671656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4537104482304 + 2024664330649 = 2130048^2 + 1422907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6561768812953 is a prime.

It is not a weakly prime, because it can be changed into another prime (6561768812957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280884406476 + 3280884406477.

It is an arithmetic number, because the mean of its divisors is an integer number (3280884406477).

Almost surely, 2^{6561768812953} is an apocalyptic number.

It is an amenable number.

6561768812953 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561768812953 is an equidigital number, since it uses as much as digits as its factorization.

6561768812953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 130636800, while the sum is 67.

The spelling of 6561768812953 in words is "six trillion, five hundred sixty-one billion, seven hundred sixty-eight million, eight hundred twelve thousand, nine hundred fifty-three".