1281473655678 has 12 divisors (see below), whose sum is σ = 2776526254008. Its totient is φ = 427157885220.

The previous prime is 1281473655673. The next prime is 1281473655703. The reversal of 1281473655678 is 8765563741821.

It is a happy number.

1281473655678 is a `hidden beast` number, since 1 + 2 + 8 + 1 + 4 + 7 + 3 + 6 + 556 + 78 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281473655673) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35596490418 + ... + 35596490453.

It is an arithmetic number, because the mean of its divisors is an integer number (231377187834).

Almost surely, 2^{1281473655678} is an apocalyptic number.

1281473655678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1281473655678 is an abundant number, since it is smaller than the sum of its proper divisors (1495052598330).

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

1281473655678 is a wasteful number, since it uses less digits than its factorization.

1281473655678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71192980879 (or 71192980876 counting only the distinct ones).

The product of its digits is 67737600, while the sum is 63.

The spelling of 1281473655678 in words is "one trillion, two hundred eighty-one billion, four hundred seventy-three million, six hundred fifty-five thousand, six hundred seventy-eight".