11500661061155 has 16 divisors (see below), whose sum is σ = 16094219563200. Its totient is φ = 7886167583616.

The previous prime is 11500661061151. The next prime is 11500661061251. The reversal of 11500661061155 is 55116016600511.

It is a happy number.

11500661061155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11500661061155 - 2² = 11500661061151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11500661061151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3352960694 + ... + 3352964123.

It is an arithmetic number, because the mean of its divisors is an integer number (1005888722700).

Almost surely, 2^{11500661061155} is an apocalyptic number.

11500661061155 is a deficient number, since it is larger than the sum of its proper divisors (4593558502045).

11500661061155 is an frugal number, since it uses more digits than its factorization.

11500661061155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6705924843 (or 6705924829 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 38.

Adding to 11500661061155 its reverse (55116016600511), we get a palindrome (66616677661666).

The spelling of 11500661061155 in words is "eleven trillion, five hundred billion, six hundred sixty-one million, sixty-one thousand, one hundred fifty-five".