12111553540 has 48 divisors (see below), whose sum is σ = 25675664112. Its totient is φ = 4798849536.

The previous prime is 12111553529. The next prime is 12111553549. The reversal of 12111553540 is 4535511121.

It can be written as a sum of positive squares in 8 ways, for example, as 708730884 + 11402822656 = 26622^2 + 106784^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12111553499 and 12111553508.

It is not an unprimeable number, because it can be changed into a prime (12111553549) 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, 952102 + ... + 964738.

It is an arithmetic number, because the mean of its divisors is an integer number (534909669).

Almost surely, 2^12111553540 is an apocalyptic number.

12111553540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111553540 is an abundant number, since it is smaller than the sum of its proper divisors (13564110572).

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

12111553540 is a wasteful number, since it uses less digits than its factorization.

12111553540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13096 (or 13094 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 12111553540 in words is "twelve billion, one hundred eleven million, five hundred fifty-three thousand, five hundred forty".