1555616968079 has 2 divisors, whose sum is σ = 1555616968080. Its totient is φ = 1555616968078.

The previous prime is 1555616968067. The next prime is 1555616968181. The reversal of 1555616968079 is 9708696165551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1555616968079 - 2⁴⁰ = 456105340303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555616968019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777808484039 + 777808484040.

It is an arithmetic number, because the mean of its divisors is an integer number (777808484040).

Almost surely, 2^{1555616968079} is an apocalyptic number.

1555616968079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555616968079 is an equidigital number, since it uses as much as digits as its factorization.

1555616968079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472000, while the sum is 68.

The spelling of 1555616968079 in words is "one trillion, five hundred fifty-five billion, six hundred sixteen million, nine hundred sixty-eight thousand, seventy-nine".