265563323401 has 2 divisors, whose sum is σ = 265563323402. Its totient is φ = 265563323400.

The previous prime is 265563323393. The next prime is 265563323407. The reversal of 265563323401 is 104323365562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210335973376 + 55227350025 = 458624^2 + 235005^2 .

It is a cyclic number.

It is not a de Polignac number, because 265563323401 - 2³ = 265563323393 is a prime.

It is a super-2 number, since 2×265563323401² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (265563323407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132781661700 + 132781661701.

It is an arithmetic number, because the mean of its divisors is an integer number (132781661701).

Almost surely, 2^265563323401 is an apocalyptic number.

It is an amenable number.

265563323401 is a deficient number, since it is larger than the sum of its proper divisors (1).

265563323401 is an equidigital number, since it uses as much as digits as its factorization.

265563323401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 40.

Adding to 265563323401 its reverse (104323365562), we get a palindrome (369886688963).

The spelling of 265563323401 in words is "two hundred sixty-five billion, five hundred sixty-three million, three hundred twenty-three thousand, four hundred one".