1311649772705 has 4 divisors (see below), whose sum is σ = 1573979727252. Its totient is φ = 1049319818160.

The previous prime is 1311649772689. The next prime is 1311649772729. The reversal of 1311649772705 is 5072779461131.

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 924999609361 + 386650163344 = 961769^2 + 621812^2 .

It is not a de Polignac number, because 1311649772705 - 2⁴ = 1311649772689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131164977266 + ... + 131164977275.

It is an arithmetic number, because the mean of its divisors is an integer number (393494931813).

Almost surely, 2^{1311649772705} is an apocalyptic number.

It is an amenable number.

1311649772705 is a deficient number, since it is larger than the sum of its proper divisors (262329954547).

1311649772705 is an equidigital number, since it uses as much as digits as its factorization.

1311649772705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262329954546.

The product of its (nonzero) digits is 2222640, while the sum is 53.

The spelling of 1311649772705 in words is "one trillion, three hundred eleven billion, six hundred forty-nine million, seven hundred seventy-two thousand, seven hundred five".