1277776252979 has 2 divisors, whose sum is σ = 1277776252980. Its totient is φ = 1277776252978.

The previous prime is 1277776252903. The next prime is 1277776252997. The reversal of 1277776252979 is 9792526777721.

Together with next prime (1277776252997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (9792526777721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1277776252979 - 2²⁰ = 1277775204403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1277776255979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638888126489 + 638888126490.

It is an arithmetic number, because the mean of its divisors is an integer number (638888126490).

Almost surely, 2^{1277776252979} is an apocalyptic number.

1277776252979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277776252979 is an equidigital number, since it uses as much as digits as its factorization.

1277776252979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326728080, while the sum is 71.

The spelling of 1277776252979 in words is "one trillion, two hundred seventy-seven billion, seven hundred seventy-six million, two hundred fifty-two thousand, nine hundred seventy-nine".