11561554260 has 72 divisors (see below), whose sum is σ = 35180852616. Its totient is φ = 3073340160.

The previous prime is 11561554247. The next prime is 11561554267. The reversal of 11561554260 is 6245516511.

11561554260 is a `hidden beast` number, since 1 + 1 + 56 + 1 + 5 + 542 + 60 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1894338576 + 9667215684 = 43524^2 + 98322^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561554267) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44251 + ... + 158370.

It is an arithmetic number, because the mean of its divisors is an integer number (488622953).

Almost surely, 2^11561554260 is an apocalyptic number.

11561554260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11561554260 is an abundant number, since it is smaller than the sum of its proper divisors (23619298356).

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

11561554260 is a wasteful number, since it uses less digits than its factorization.

11561554260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202953 (or 202948 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 11561554260 in words is "eleven billion, five hundred sixty-one million, five hundred fifty-four thousand, two hundred sixty".