11984531555 has 4 divisors (see below), whose sum is σ = 14381437872. Its totient is φ = 9587625240.

The previous prime is 11984531539. The next prime is 11984531557. The reversal of 11984531555 is 55513548911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55513548911 = 186959 ⋅296929.

It is not a de Polignac number, because 11984531555 - 2⁴ = 11984531539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11984531557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1198453151 + ... + 1198453160.

It is an arithmetic number, because the mean of its divisors is an integer number (3595359468).

Almost surely, 2^11984531555 is an apocalyptic number.

11984531555 is a deficient number, since it is larger than the sum of its proper divisors (2396906317).

11984531555 is an equidigital number, since it uses as much as digits as its factorization.

11984531555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396906316.

The product of its digits is 540000, while the sum is 47.

The spelling of 11984531555 in words is "eleven billion, nine hundred eighty-four million, five hundred thirty-one thousand, five hundred fifty-five".