11501661516161 has 32 divisors (see below), whose sum is σ = 12425660706816. Its totient is φ = 10623742272000.

The previous prime is 11501661516139. The next prime is 11501661516179. The reversal of 11501661516161 is 16161516610511.

11501661516161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11501661516161 - 2¹⁴ = 11501661499777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11501661510161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 512517701 + ... + 512540141.

It is an arithmetic number, because the mean of its divisors is an integer number (388301897088).

Almost surely, 2^{11501661516161} is an apocalyptic number.

It is an amenable number.

11501661516161 is a deficient number, since it is larger than the sum of its proper divisors (923999190655).

11501661516161 is a wasteful number, since it uses less digits than its factorization.

11501661516161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30993.

The product of its (nonzero) digits is 32400, while the sum is 41.

The spelling of 11501661516161 in words is "eleven trillion, five hundred one billion, six hundred sixty-one million, five hundred sixteen thousand, one hundred sixty-one".