1256843977876 has 12 divisors (see below), whose sum is σ = 2199709456672. Its totient is φ = 628355561688.

The previous prime is 1256843977861. The next prime is 1256843977897. The reversal of 1256843977876 is 6787793486521.

It is a junction number, because it is equal to n+sod(n) for n = 1256843977799 and 1256843977808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16564230 + ... + 16639933.

Almost surely, 2^{1256843977876} is an apocalyptic number.

It is an amenable number.

1256843977876 is a deficient number, since it is larger than the sum of its proper divisors (942865478796).

1256843977876 is a wasteful number, since it uses less digits than its factorization.

1256843977876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33213630 (or 33213628 counting only the distinct ones).

The product of its digits is 853493760, while the sum is 73.

The spelling of 1256843977876 in words is "one trillion, two hundred fifty-six billion, eight hundred forty-three million, nine hundred seventy-seven thousand, eight hundred seventy-six".