9855578755559 has 2 divisors, whose sum is σ = 9855578755560. Its totient is φ = 9855578755558.

The previous prime is 9855578755513. The next prime is 9855578755621. The reversal of 9855578755559 is 9555578755589.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9855578755559 - 2¹² = 9855578751463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9855578755159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927789377779 + 4927789377780.

It is an arithmetic number, because the mean of its divisors is an integer number (4927789377780).

Almost surely, 2^{9855578755559} is an apocalyptic number.

9855578755559 is a deficient number, since it is larger than the sum of its proper divisors (1).

9855578755559 is an equidigital number, since it uses as much as digits as its factorization.

9855578755559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19845000000, while the sum is 83.

The spelling of 9855578755559 in words is "nine trillion, eight hundred fifty-five billion, five hundred seventy-eight million, seven hundred fifty-five thousand, five hundred fifty-nine".