11005505513 has 4 divisors (see below), whose sum is σ = 11005768788. Its totient is φ = 11005242240.

The previous prime is 11005505507. The next prime is 11005505549. The reversal of 11005505513 is 31550550011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31550550011 = 181 ⋅174312431.

It can be written as a sum of positive squares in 2 ways, for example, as 9528102544 + 1477402969 = 97612^2 + 38437^2 .

It is a cyclic number.

It is not a de Polignac number, because 11005505513 - 2⁸ = 11005505257 is a prime.

It is a super-2 number, since 2×11005505513² (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 (11005505573) 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 3 ways as a sum of consecutive naturals, for example, 53456 + ... + 157697.

It is an arithmetic number, because the mean of its divisors is an integer number (2751442197).

Almost surely, 2^11005505513 is an apocalyptic number.

It is an amenable number.

11005505513 is a deficient number, since it is larger than the sum of its proper divisors (263275).

11005505513 is an equidigital number, since it uses as much as digits as its factorization.

11005505513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263274.

The product of its (nonzero) digits is 1875, while the sum is 26.

The spelling of 11005505513 in words is "eleven billion, five million, five hundred five thousand, five hundred thirteen".