11118163606561 has 12 divisors (see below), whose sum is σ = 12248629254400. Its totient is φ = 10084397673240.

The previous prime is 11118163606559. The next prime is 11118163606591. The reversal of 11118163606561 is 16560636181111.

It is not a de Polignac number, because 11118163606561 - 2¹ = 11118163606559 is a prime.

It is a super-2 number, since 2×11118163606561² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11118163606591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104600241 + ... + 104706478.

Almost surely, 2^{11118163606561} is an apocalyptic number.

11118163606561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11118163606561 is a deficient number, since it is larger than the sum of its proper divisors (1130465647839).

11118163606561 is a wasteful number, since it uses less digits than its factorization.

11118163606561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209307180 (or 209307169 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 46.

Adding to 11118163606561 its reverse (16560636181111), we get a palindrome (27678799787672).

The spelling of 11118163606561 in words is "eleven trillion, one hundred eighteen billion, one hundred sixty-three million, six hundred six thousand, five hundred sixty-one".