11561361156165 has 32 divisors (see below), whose sum is σ = 19325730942720. Its totient is φ = 5890855044096.

The previous prime is 11561361156157. The next prime is 11561361156217. The reversal of 11561361156165 is 56165116316511.

It is not a de Polignac number, because 11561361156165 - 2³ = 11561361156157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19925812 + ... + 20497821.

It is an arithmetic number, because the mean of its divisors is an integer number (603929091960).

Almost surely, 2^{11561361156165} is an apocalyptic number.

11561361156165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11561361156165 is a deficient number, since it is larger than the sum of its proper divisors (7764369786555).

11561361156165 is a wasteful number, since it uses less digits than its factorization.

11561361156165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40424493.

The product of its digits is 486000, while the sum is 48.

The spelling of 11561361156165 in words is "eleven trillion, five hundred sixty-one billion, three hundred sixty-one million, one hundred fifty-six thousand, one hundred sixty-five".