1278311127826 has 16 divisors (see below), whose sum is σ = 1931442559200. Its totient is φ = 634497804288.

The previous prime is 1278311127811. The next prime is 1278311127833. The reversal of 1278311127826 is 6287211138721.

It is a super-2 number, since 2×1278311127826² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1278311127826.

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, 2830866 + ... + 3251218.

It is an arithmetic number, because the mean of its divisors is an integer number (120715159950).

Almost surely, 2^{1278311127826} is an apocalyptic number.

1278311127826 is a deficient number, since it is larger than the sum of its proper divisors (653131431374).

1278311127826 is a wasteful number, since it uses less digits than its factorization.

1278311127826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431433.

The product of its digits is 451584, while the sum is 49.

The spelling of 1278311127826 in words is "one trillion, two hundred seventy-eight billion, three hundred eleven million, one hundred twenty-seven thousand, eight hundred twenty-six".