11161261403736 has 128 divisors (see below), whose sum is σ = 29591780198400. Its totient is φ = 3503786526720.

The previous prime is 11161261403603. The next prime is 11161261403749. The reversal of 11161261403736 is 63730416216111.

It is a super-2 number, since 2×11161261403736² (a number of 27 digits) contains 22 as substring.

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, 1723125 + ... + 5029083.

It is an arithmetic number, because the mean of its divisors is an integer number (231185782800).

Almost surely, 2^{11161261403736} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11161261403736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14795890099200).

11161261403736 is an abundant number, since it is smaller than the sum of its proper divisors (18430518794664).

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

11161261403736 is a wasteful number, since it uses less digits than its factorization.

11161261403736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306129 (or 3306125 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

Adding to 11161261403736 its reverse (63730416216111), we get a palindrome (74891677619847).

The spelling of 11161261403736 in words is "eleven trillion, one hundred sixty-one billion, two hundred sixty-one million, four hundred three thousand, seven hundred thirty-six".