9855555623 has 2 divisors, whose sum is σ = 9855555624. Its totient is φ = 9855555622.

The previous prime is 9855555533. The next prime is 9855555641. The reversal of 9855555623 is 3265555589.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (3265555589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9855555623 - 2¹⁸ = 9855293479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9855555643) 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, 4927777811 + 4927777812.

It is an arithmetic number, because the mean of its divisors is an integer number (4927777812).

Almost surely, 2^9855555623 is an apocalyptic number.

9855555623 is a deficient number, since it is larger than the sum of its proper divisors (1).

9855555623 is an equidigital number, since it uses as much as digits as its factorization.

9855555623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100000, while the sum is 53.

The square root of 9855555623 is about 99275.1510852540. The cubic root of 9855555623 is about 2144.0111411084.

The spelling of 9855555623 in words is "nine billion, eight hundred fifty-five million, five hundred fifty-five thousand, six hundred twenty-three".