265645650946961 has 2 divisors, whose sum is σ = 265645650946962. Its totient is φ = 265645650946960.

The previous prime is 265645650946919. The next prime is 265645650946969. The reversal of 265645650946961 is 169649056546562.

265645650946961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257978046273025 + 7667604673936 = 16061695^2 + 2769044^2 .

It is a cyclic number.

It is not a de Polignac number, because 265645650946961 - 2¹⁰ = 265645650945937 is a prime.

It is a super-2 number, since 2×265645650946961² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (265645650946969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132822825473480 + 132822825473481.

It is an arithmetic number, because the mean of its divisors is an integer number (132822825473481).

Almost surely, 2^{265645650946961} is an apocalyptic number.

It is an amenable number.

265645650946961 is a deficient number, since it is larger than the sum of its proper divisors (1).

265645650946961 is an equidigital number, since it uses as much as digits as its factorization.

265645650946961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424000, while the sum is 74.

The spelling of 265645650946961 in words is "two hundred sixty-five trillion, six hundred forty-five billion, six hundred fifty million, nine hundred forty-six thousand, nine hundred sixty-one".