11814436581 has 16 divisors (see below), whose sum is σ = 16057632960. Its totient is φ = 7724972160.

The previous prime is 11814436559. The next prime is 11814436591. The reversal of 11814436581 is 18563441811.

It is not a de Polignac number, because 11814436581 - 2¹⁴ = 11814420197 is a prime.

It is a super-2 number, since 2×11814436581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11814436511) 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, 111490 + ... + 189891.

It is an arithmetic number, because the mean of its divisors is an integer number (1003602060).

Almost surely, 2^11814436581 is an apocalyptic number.

It is an amenable number.

11814436581 is a deficient number, since it is larger than the sum of its proper divisors (4243196379).

11814436581 is a wasteful number, since it uses less digits than its factorization.

11814436581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301636.

The product of its digits is 92160, while the sum is 42.

The spelling of 11814436581 in words is "eleven billion, eight hundred fourteen million, four hundred thirty-six thousand, five hundred eighty-one".