1556315980789 has 2 divisors, whose sum is σ = 1556315980790. Its totient is φ = 1556315980788.

The previous prime is 1556315980763. The next prime is 1556315980859. The reversal of 1556315980789 is 9870895136551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1321081280689 + 235234700100 = 1149383^2 + 485010^2 .

It is a cyclic number.

It is not a de Polignac number, because 1556315980789 - 2¹¹ = 1556315978741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1556315980589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778157990394 + 778157990395.

It is an arithmetic number, because the mean of its divisors is an integer number (778157990395).

Almost surely, 2^{1556315980789} is an apocalyptic number.

It is an amenable number.

1556315980789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556315980789 is an equidigital number, since it uses as much as digits as its factorization.

1556315980789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648000, while the sum is 67.

The spelling of 1556315980789 in words is "one trillion, five hundred fifty-six billion, three hundred fifteen million, nine hundred eighty thousand, seven hundred eighty-nine".