19855435885 has 4 divisors (see below), whose sum is σ = 23826523068. Its totient is φ = 15884348704.

The previous prime is 19855435823. The next prime is 19855435973. The reversal of 19855435885 is 58853455891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14412242601 + 5443193284 = 120051^2 + 73778^2 .

It is a cyclic number.

It is not a de Polignac number, because 19855435885 - 2⁷ = 19855435757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985543584 + ... + 1985543593.

It is an arithmetic number, because the mean of its divisors is an integer number (5956630767).

Almost surely, 2^19855435885 is an apocalyptic number.

It is an amenable number.

19855435885 is a deficient number, since it is larger than the sum of its proper divisors (3971087183).

19855435885 is an equidigital number, since it uses as much as digits as its factorization.

19855435885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971087182.

The product of its digits is 34560000, while the sum is 61.

The spelling of 19855435885 in words is "nineteen billion, eight hundred fifty-five million, four hundred thirty-five thousand, eight hundred eighty-five".