1277776517123 has 2 divisors, whose sum is σ = 1277776517124. Its totient is φ = 1277776517122.

The previous prime is 1277776517111. The next prime is 1277776517161. The reversal of 1277776517123 is 3217156777721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1277776517123 - 2⁴⁰ = 178264889347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1277776517183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638888258561 + 638888258562.

It is an arithmetic number, because the mean of its divisors is an integer number (638888258562).

Almost surely, 2^{1277776517123} is an apocalyptic number.

1277776517123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277776517123 is an equidigital number, since it uses as much as digits as its factorization.

1277776517123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6050520, while the sum is 56.

The spelling of 1277776517123 in words is "one trillion, two hundred seventy-seven billion, seven hundred seventy-six million, five hundred seventeen thousand, one hundred twenty-three".