11561253532440 has 32 divisors (see below), whose sum is σ = 34683760597680. Its totient is φ = 3083000941952.

The previous prime is 11561253532373. The next prime is 11561253532487. The reversal of 11561253532440 is 4423535216511.

It is a junction number, because it is equal to n+sod(n) for n = 11561253532392 and 11561253532401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48171889599 + ... + 48171889838.

Almost surely, 2^{11561253532440} is an apocalyptic number.

11561253532440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11561253532440 is an abundant number, since it is smaller than the sum of its proper divisors (23122507065240).

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

11561253532440 is a wasteful number, since it uses less digits than its factorization.

11561253532440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96343779451 (or 96343779447 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

Adding to 11561253532440 its reverse (4423535216511), we get a palindrome (15984788748951).

The spelling of 11561253532440 in words is "eleven trillion, five hundred sixty-one billion, two hundred fifty-three million, five hundred thirty-two thousand, four hundred forty".