11131266505 has 8 divisors (see below), whose sum is σ = 13683313224. Its totient is φ = 8687817600.

The previous prime is 11131266493. The next prime is 11131266551. The reversal of 11131266505 is 50566213111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 288626121 + 10842640384 = 16989^2 + 104128^2 .

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

It is not a de Polignac number, because 11131266505 - 2⁵ = 11131266473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27149226 + ... + 27149635.

It is an arithmetic number, because the mean of its divisors is an integer number (1710414153).

Almost surely, 2^11131266505 is an apocalyptic number.

It is an amenable number.

11131266505 is a deficient number, since it is larger than the sum of its proper divisors (2552046719).

11131266505 is an equidigital number, since it uses as much as digits as its factorization.

11131266505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54298907.

The product of its (nonzero) digits is 5400, while the sum is 31.

Adding to 11131266505 its reverse (50566213111), we get a palindrome (61697479616).

The spelling of 11131266505 in words is "eleven billion, one hundred thirty-one million, two hundred sixty-six thousand, five hundred five".