12556518121095 has 128 divisors (see below), whose sum is σ = 22098366259200. Its totient is φ = 6051158784000.

The previous prime is 12556518121093. The next prime is 12556518121141. The reversal of 12556518121095 is 59012181565521.

It is a happy number.

It is not a de Polignac number, because 12556518121095 - 2¹ = 12556518121093 is a prime.

It is a super-2 number, since 2×12556518121095² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12556518121093) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1028289540 + ... + 1028301750.

It is an arithmetic number, because the mean of its divisors is an integer number (172643486400).

Almost surely, 2^{12556518121095} is an apocalyptic number.

12556518121095 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12556518121095 is a deficient number, since it is larger than the sum of its proper divisors (9541848138105).

12556518121095 is a wasteful number, since it uses less digits than its factorization.

12556518121095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12921.

The product of its (nonzero) digits is 1080000, while the sum is 51.

The spelling of 12556518121095 in words is "twelve trillion, five hundred fifty-six billion, five hundred eighteen million, one hundred twenty-one thousand, ninety-five".