1276423517791 has 2 divisors, whose sum is σ = 1276423517792. Its totient is φ = 1276423517790.

The previous prime is 1276423517777. The next prime is 1276423517807. The reversal of 1276423517791 is 1977153246721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1276423517791 - 2⁹ = 1276423517279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276423517741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638211758895 + 638211758896.

It is an arithmetic number, because the mean of its divisors is an integer number (638211758896).

Almost surely, 2^{1276423517791} is an apocalyptic number.

1276423517791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276423517791 is an equidigital number, since it uses as much as digits as its factorization.

1276423517791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 55.

The spelling of 1276423517791 in words is "one trillion, two hundred seventy-six billion, four hundred twenty-three million, five hundred seventeen thousand, seven hundred ninety-one".