12511115055 has 24 divisors (see below), whose sum is σ = 21960444480. Its totient is φ = 6588129600.

The previous prime is 12511115053. The next prime is 12511115077. The reversal of 12511115055 is 55051111521.

It is a happy number.

It is not a de Polignac number, because 12511115055 - 2¹ = 12511115053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12511115051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1756096 + ... + 1763205.

It is an arithmetic number, because the mean of its divisors is an integer number (915018520).

Almost surely, 2^12511115055 is an apocalyptic number.

12511115055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12511115055 is a deficient number, since it is larger than the sum of its proper divisors (9449329425).

12511115055 is a wasteful number, since it uses less digits than its factorization.

12511115055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519391 (or 3519388 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 27.

Adding to 12511115055 its reverse (55051111521), we get a palindrome (67562226576).

The spelling of 12511115055 in words is "twelve billion, five hundred eleven million, one hundred fifteen thousand, fifty-five".