1278062773657 has 2 divisors, whose sum is σ = 1278062773658. Its totient is φ = 1278062773656.

The previous prime is 1278062773619. The next prime is 1278062773661. The reversal of 1278062773657 is 7563772608721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1205650116441 + 72412657216 = 1098021^2 + 269096^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278062773657 - 2³¹ = 1275915290009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1278062773595 and 1278062773604.

It is not a weakly prime, because it can be changed into another prime (1278062773957) 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, 639031386828 + 639031386829.

It is an arithmetic number, because the mean of its divisors is an integer number (639031386829).

Almost surely, 2^{1278062773657} is an apocalyptic number.

It is an amenable number.

1278062773657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278062773657 is an equidigital number, since it uses as much as digits as its factorization.

1278062773657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41489280, while the sum is 61.

The spelling of 1278062773657 in words is "one trillion, two hundred seventy-eight billion, sixty-two million, seven hundred seventy-three thousand, six hundred fifty-seven".