265236638543 has 2 divisors, whose sum is σ = 265236638544. Its totient is φ = 265236638542.

The previous prime is 265236638521. The next prime is 265236638617. The reversal of 265236638543 is 345836632562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265236638543 - 2⁶ = 265236638479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265236638743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132618319271 + 132618319272.

It is an arithmetic number, because the mean of its divisors is an integer number (132618319272).

Almost surely, 2^265236638543 is an apocalyptic number.

265236638543 is a deficient number, since it is larger than the sum of its proper divisors (1).

265236638543 is an equidigital number, since it uses as much as digits as its factorization.

265236638543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18662400, while the sum is 53.

The spelling of 265236638543 in words is "two hundred sixty-five billion, two hundred thirty-six million, six hundred thirty-eight thousand, five hundred forty-three".