1555555555559 has 2 divisors, whose sum is σ = 1555555555560. Its totient is φ = 1555555555558.

The previous prime is 1555555555529. The next prime is 1555555555621. The reversal of 1555555555559 is 9555555555551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1555555555559 - 2²⁰ = 1555554506983 is a prime.

It is a plaindrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 1555555555495 and 1555555555504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555555555529) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777777777779 + 777777777780.

It is an arithmetic number, because the mean of its divisors is an integer number (777777777780).

Almost surely, 2^{1555555555559} is an apocalyptic number.

1555555555559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555555555559 is an equidigital number, since it uses as much as digits as its factorization.

1555555555559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 439453125, while the sum is 65.

The spelling of 1555555555559 in words is "one trillion, five hundred fifty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred fifty-nine".