265561421111 has 12 divisors (see below), whose sum is σ = 309278062440. Its totient is φ = 227359051920.

The previous prime is 265561421087. The next prime is 265561421123. The reversal of 265561421111 is 111124165562.

It is not a de Polignac number, because 265561421111 - 2²² = 265557226807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265561421161) 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 in 11 ways as a sum of consecutive naturals, for example, 3112520 + ... + 3196701.

It is an arithmetic number, because the mean of its divisors is an integer number (25773171870).

Almost surely, 2^265561421111 is an apocalyptic number.

265561421111 is a deficient number, since it is larger than the sum of its proper divisors (43716641329).

265561421111 is an equidigital number, since it uses as much as digits as its factorization.

265561421111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6310094 (or 6310087 counting only the distinct ones).

The product of its digits is 14400, while the sum is 35.

Adding to 265561421111 its reverse (111124165562), we get a palindrome (376685586673).

The spelling of 265561421111 in words is "two hundred sixty-five billion, five hundred sixty-one million, four hundred twenty-one thousand, one hundred eleven".