1277166668555 has 16 divisors (see below), whose sum is σ = 1616856228000. Its totient is φ = 965802055680.

The previous prime is 1277166668539. The next prime is 1277166668573. The reversal of 1277166668555 is 5558666617721.

It is not a de Polignac number, because 1277166668555 - 2⁴ = 1277166668539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1277166668491 and 1277166668500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14928236 + ... + 15013545.

It is an arithmetic number, because the mean of its divisors is an integer number (101053514250).

Almost surely, 2^{1277166668555} is an apocalyptic number.

1277166668555 is a deficient number, since it is larger than the sum of its proper divisors (339689559445).

1277166668555 is a wasteful number, since it uses less digits than its factorization.

1277166668555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29942254.

The product of its digits is 127008000, while the sum is 65.

The spelling of 1277166668555 in words is "one trillion, two hundred seventy-seven billion, one hundred sixty-six million, six hundred sixty-eight thousand, five hundred fifty-five".