19855435823 has 2 divisors, whose sum is σ = 19855435824. Its totient is φ = 19855435822.

The previous prime is 19855435811. The next prime is 19855435973. The reversal of 19855435823 is 32853455891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19855435823 - 2¹⁰ = 19855434799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19855431823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9927717911 + 9927717912.

It is an arithmetic number, because the mean of its divisors is an integer number (9927717912).

Almost surely, 2^19855435823 is an apocalyptic number.

19855435823 is a deficient number, since it is larger than the sum of its proper divisors (1).

19855435823 is an equidigital number, since it uses as much as digits as its factorization.

19855435823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184000, while the sum is 53.

The spelling of 19855435823 in words is "nineteen billion, eight hundred fifty-five million, four hundred thirty-five thousand, eight hundred twenty-three".