11755636581 has 16 divisors (see below), whose sum is σ = 16882046720. Its totient is φ = 7233312960.

The previous prime is 11755636579. The next prime is 11755636583. The reversal of 11755636581 is 18563655711.

It is an interprime number because it is at equal distance from previous prime (11755636579) and next prime (11755636583).

It is not a de Polignac number, because 11755636581 - 2¹ = 11755636579 is a prime.

It is a super-2 number, since 2×11755636581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11755636581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11755636583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411636 + ... + 439266.

It is an arithmetic number, because the mean of its divisors is an integer number (1055127920).

Almost surely, 2^11755636581 is an apocalyptic number.

It is an amenable number.

11755636581 is a deficient number, since it is larger than the sum of its proper divisors (5126410139).

11755636581 is a wasteful number, since it uses less digits than its factorization.

11755636581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38556.

The product of its digits is 756000, while the sum is 48.

The spelling of 11755636581 in words is "eleven billion, seven hundred fifty-five million, six hundred thirty-six thousand, five hundred eighty-one".