11161201111556 has 24 divisors (see below), whose sum is σ = 19559943563160. Its totient is φ = 5572648627200.

The previous prime is 11161201111553. The next prime is 11161201111573. The reversal of 11161201111556 is 65511110216111.

It can be written as a sum of positive squares in 4 ways, for example, as 3197065585156 + 7964135526400 = 1788034^2 + 2822080^2 .

It is a super-2 number, since 2×11161201111556² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11161201111553) 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, 15613940 + ... + 16313108.

It is an arithmetic number, because the mean of its divisors is an integer number (814997648465).

Almost surely, 2^{11161201111556} is an apocalyptic number.

It is an amenable number.

11161201111556 is a deficient number, since it is larger than the sum of its proper divisors (8398742451604).

11161201111556 is a wasteful number, since it uses less digits than its factorization.

11161201111556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704855 (or 704853 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 32.

Adding to 11161201111556 its reverse (65511110216111), we get a palindrome (76672311327667).

The spelling of 11161201111556 in words is "eleven trillion, one hundred sixty-one billion, two hundred one million, one hundred eleven thousand, five hundred fifty-six".