11111265505 has 8 divisors (see below), whose sum is σ = 13355488512. Its totient is φ = 8874365808.

The previous prime is 11111265497. The next prime is 11111265509. The reversal of 11111265505 is 50556211111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111265505 - 2³ = 11111265497 is a prime.

It is a super-2 number, since 2×11111265505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111265509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1827487 + ... + 1833556.

It is an arithmetic number, because the mean of its divisors is an integer number (1669436064).

Almost surely, 2^11111265505 is an apocalyptic number.

It is an amenable number.

11111265505 is a deficient number, since it is larger than the sum of its proper divisors (2244223007).

11111265505 is an equidigital number, since it uses as much as digits as its factorization.

11111265505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661655.

The product of its (nonzero) digits is 1500, while the sum is 28.

Adding to 11111265505 its reverse (50556211111), we get a palindrome (61667476616).

The spelling of 11111265505 in words is "eleven billion, one hundred eleven million, two hundred sixty-five thousand, five hundred five".