1278967185856 has 56 divisors (see below), whose sum is σ = 2590090706016. Its totient is φ = 626460656640.

The previous prime is 1278967185851. The next prime is 1278967185877. The reversal of 1278967185856 is 6585817698721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278967185851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182971 + ... + 1609786.

Almost surely, 2^{1278967185856} is an apocalyptic number.

1278967185856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1278967185856 is an abundant number, since it is smaller than the sum of its proper divisors (1311123520160).

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

1278967185856 is a wasteful number, since it uses less digits than its factorization.

1278967185856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792997 (or 1792987 counting only the distinct ones).

The product of its digits is 406425600, while the sum is 73.

The spelling of 1278967185856 in words is "one trillion, two hundred seventy-eight billion, nine hundred sixty-seven million, one hundred eighty-five thousand, eight hundred fifty-six".