1278505049563 has 12 divisors (see below), whose sum is σ = 1535216071872. Its totient is φ = 1060511099760.

The previous prime is 1278505049513. The next prime is 1278505049567. The reversal of 1278505049563 is 3659405058721.

It is not a de Polignac number, because 1278505049563 - 2³⁷ = 1141066096091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278505049567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 420836220 + ... + 420839257.

It is an arithmetic number, because the mean of its divisors is an integer number (127934672656).

It is a 1-persistent number, because it is pandigital, but 2⋅1278505049563 = 2557010099126 is not.

Almost surely, 2^{1278505049563} is an apocalyptic number.

1278505049563 is a deficient number, since it is larger than the sum of its proper divisors (256711022309).

1278505049563 is an equidigital number, since it uses as much as digits as its factorization.

1278505049563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841675522 (or 841675515 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 55.

The spelling of 1278505049563 in words is "one trillion, two hundred seventy-eight billion, five hundred five million, forty-nine thousand, five hundred sixty-three".