1279188778411 has 4 divisors (see below), whose sum is σ = 1279204654000. Its totient is φ = 1279172902824.

The previous prime is 1279188778397. The next prime is 1279188778513. The reversal of 1279188778411 is 1148778819721.

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

It is a cyclic number.

It is not a de Polignac number, because 1279188778411 - 2⁹ = 1279188777899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279188718411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7816311 + ... + 7978288.

It is an arithmetic number, because the mean of its divisors is an integer number (319801163500).

Almost surely, 2^{1279188778411} is an apocalyptic number.

1279188778411 is a deficient number, since it is larger than the sum of its proper divisors (15875589).

1279188778411 is an equidigital number, since it uses as much as digits as its factorization.

1279188778411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15875588.

The product of its digits is 12644352, while the sum is 64.

The spelling of 1279188778411 in words is "one trillion, two hundred seventy-nine billion, one hundred eighty-eight million, seven hundred seventy-eight thousand, four hundred eleven".