1271406673505 has 4 divisors (see below), whose sum is σ = 1525688008212. Its totient is φ = 1017125338800.

The previous prime is 1271406673489. The next prime is 1271406673543. The reversal of 1271406673505 is 5053766041721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 341964139729 + 929442533776 = 584777^2 + 964076^2 .

It is not a de Polignac number, because 1271406673505 - 2⁴ = 1271406673489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1271406673505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127140667346 + ... + 127140667355.

It is an arithmetic number, because the mean of its divisors is an integer number (381422002053).

Almost surely, 2^{1271406673505} is an apocalyptic number.

It is an amenable number.

1271406673505 is a deficient number, since it is larger than the sum of its proper divisors (254281334707).

1271406673505 is an equidigital number, since it uses as much as digits as its factorization.

1271406673505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254281334706.

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 1271406673505 in words is "one trillion, two hundred seventy-one billion, four hundred six million, six hundred seventy-three thousand, five hundred five".