1280042877555 has 32 divisors (see below), whose sum is σ = 2450680384320. Its totient is φ = 630174954240.

The previous prime is 1280042877551. The next prime is 1280042877583. The reversal of 1280042877555 is 5557782400821.

It is a happy number.

1280042877555 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 0 + 4 + 2 + 87 + 7 + 555 = 666.

It is not a de Polignac number, because 1280042877555 - 2² = 1280042877551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280042877551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 364682826 + ... + 364686335.

It is an arithmetic number, because the mean of its divisors is an integer number (76583762010).

Almost surely, 2^{1280042877555} is an apocalyptic number.

1280042877555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1280042877555 is a deficient number, since it is larger than the sum of its proper divisors (1170637506765).

1280042877555 is a wasteful number, since it uses less digits than its factorization.

1280042877555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729369188 (or 729369182 counting only the distinct ones).

The product of its (nonzero) digits is 6272000, while the sum is 54.

The spelling of 1280042877555 in words is "one trillion, two hundred eighty billion, forty-two million, eight hundred seventy-seven thousand, five hundred fifty-five".