11005115545 has 4 divisors (see below), whose sum is σ = 13206138660. Its totient is φ = 8804092432.

The previous prime is 11005115497. The next prime is 11005115551. The reversal of 11005115545 is 54551150011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54551150011 = 41413 ⋅1317247.

It can be written as a sum of positive squares in 2 ways, for example, as 3372821776 + 7632293769 = 58076^2 + 87363^2 .

It is a cyclic number.

It is not a de Polignac number, because 11005115545 - 2²⁵ = 10971561113 is a prime.

It is a super-2 number, since 2×11005115545² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1100511550 + ... + 1100511559.

It is an arithmetic number, because the mean of its divisors is an integer number (3301534665).

Almost surely, 2^11005115545 is an apocalyptic number.

It is an amenable number.

11005115545 is a deficient number, since it is larger than the sum of its proper divisors (2201023115).

11005115545 is an equidigital number, since it uses as much as digits as its factorization.

11005115545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201023114.

The product of its (nonzero) digits is 2500, while the sum is 28.

Adding to 11005115545 its reverse (54551150011), we get a palindrome (65556265556).

The spelling of 11005115545 in words is "eleven billion, five million, one hundred fifteen thousand, five hundred forty-five".