11511145554220 has 24 divisors (see below), whose sum is σ = 26032898407824. Its totient is φ = 4250269127616.

The previous prime is 11511145554211. The next prime is 11511145554221. The reversal of 11511145554220 is 2245554111511.

11511145554220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 11511145554220.

It is not an unprimeable number, because it can be changed into a prime (11511145554221) 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, 22136818114 + ... + 22136818633.

It is an arithmetic number, because the mean of its divisors is an integer number (1084704100326).

Almost surely, 2^{11511145554220} is an apocalyptic number.

11511145554220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11511145554220 is an abundant number, since it is smaller than the sum of its proper divisors (14521752853604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11511145554220 is a wasteful number, since it uses less digits than its factorization.

11511145554220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44273636769 (or 44273636767 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 37.

Adding to 11511145554220 its reverse (2245554111511), we get a palindrome (13756699665731).

The spelling of 11511145554220 in words is "eleven trillion, five hundred eleven billion, one hundred forty-five million, five hundred fifty-four thousand, two hundred twenty".