12558136778 has 16 divisors (see below), whose sum is σ = 20668468896. Its totient is φ = 5675246640.

The previous prime is 12558136769. The next prime is 12558136807. The reversal of 12558136778 is 87763185521.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1645976 + ... + 1653587.

It is an arithmetic number, because the mean of its divisors is an integer number (1291779306).

Almost surely, 2^12558136778 is an apocalyptic number.

12558136778 is a deficient number, since it is larger than the sum of its proper divisors (8110332118).

12558136778 is a wasteful number, since it uses less digits than its factorization.

12558136778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299749.

The product of its digits is 2822400, while the sum is 53.

The spelling of 12558136778 in words is "twelve billion, five hundred fifty-eight million, one hundred thirty-six thousand, seven hundred seventy-eight".