12400027751556 has 144 divisors (see below), whose sum is σ = 33362329728000. Its totient is φ = 3875048185536.

The previous prime is 12400027751497. The next prime is 12400027751591. The reversal of 12400027751556 is 65515772000421.

12400027751556 is a `hidden beast` number, since 1 + 2 + 4 + 0 + 0 + 0 + 27 + 75 + 1 + 556 = 666.

It is a super-2 number, since 2×12400027751556² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10478115 + ... + 11601333.

Almost surely, 2^{12400027751556} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12400027751556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16681164864000).

12400027751556 is an abundant number, since it is smaller than the sum of its proper divisors (20962301976444).

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

12400027751556 is a wasteful number, since it uses less digits than its factorization.

12400027751556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123518 (or 1123513 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 45.

Adding to 12400027751556 its reverse (65515772000421), we get a palindrome (77915799751977).

The spelling of 12400027751556 in words is "twelve trillion, four hundred billion, twenty-seven million, seven hundred fifty-one thousand, five hundred fifty-six".