265666256563 has 2 divisors, whose sum is σ = 265666256564. Its totient is φ = 265666256562.

The previous prime is 265666256497. The next prime is 265666256567. The reversal of 265666256563 is 365652666562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265666256563 - 2³⁷ = 128227303091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 265666256498 and 265666256507.

It is not a weakly prime, because it can be changed into another prime (265666256567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132833128281 + 132833128282.

It is an arithmetic number, because the mean of its divisors is an integer number (132833128282).

Almost surely, 2^265666256563 is an apocalyptic number.

265666256563 is a deficient number, since it is larger than the sum of its proper divisors (1).

265666256563 is an equidigital number, since it uses as much as digits as its factorization.

265666256563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984000, while the sum is 58.

The spelling of 265666256563 in words is "two hundred sixty-five billion, six hundred sixty-six million, two hundred fifty-six thousand, five hundred sixty-three".