12778747278125 has 12 divisors (see below), whose sum is σ = 15972411801780. Its totient is φ = 10222997820000.

The previous prime is 12778747277929. The next prime is 12778747278139. The reversal of 12778747278125 is 52187274787721.

It can be written as a sum of positive squares in 6 ways, for example, as 9431464802761 + 3347282475364 = 3071069^2 + 1829558^2 .

It is not a de Polignac number, because 12778747278125 - 2³⁰ = 12777673536301 is a prime.

It is a super-2 number, since 2×12778747278125² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 2044596440 + ... + 2044602689.

It is an arithmetic number, because the mean of its divisors is an integer number (1331034316815).

Almost surely, 2^{12778747278125} is an apocalyptic number.

It is an amenable number.

12778747278125 is a deficient number, since it is larger than the sum of its proper divisors (3193664523655).

12778747278125 is an frugal number, since it uses more digits than its factorization.

12778747278125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4089199154 (or 4089199134 counting only the distinct ones).

The product of its digits is 172103680, while the sum is 68.

The spelling of 12778747278125 in words is "twelve trillion, seven hundred seventy-eight billion, seven hundred forty-seven million, two hundred seventy-eight thousand, one hundred twenty-five".