1277085118709 has 2 divisors, whose sum is σ = 1277085118710. Its totient is φ = 1277085118708.

The previous prime is 1277085118667. The next prime is 1277085118739. The reversal of 1277085118709 is 9078115807721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639115505809 + 637969612900 = 799447^2 + 798730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1277085118709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1277085118739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638542559354 + 638542559355.

It is an arithmetic number, because the mean of its divisors is an integer number (638542559355).

Almost surely, 2^{1277085118709} is an apocalyptic number.

It is an amenable number.

1277085118709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277085118709 is an equidigital number, since it uses as much as digits as its factorization.

1277085118709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 56.

The spelling of 1277085118709 in words is "one trillion, two hundred seventy-seven billion, eighty-five million, one hundred eighteen thousand, seven hundred nine".