19987043853 has 8 divisors (see below), whose sum is σ = 30456447808. Its totient is φ = 11421167904.

The previous prime is 19987043851. The next prime is 19987043897. The reversal of 19987043853 is 35834078991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19987043853 - 2¹ = 19987043851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19987043793 and 19987043802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19987043851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475881976 + ... + 475882017.

It is an arithmetic number, because the mean of its divisors is an integer number (3807055976).

Almost surely, 2^19987043853 is an apocalyptic number.

It is an amenable number.

19987043853 is a deficient number, since it is larger than the sum of its proper divisors (10469403955).

19987043853 is an equidigital number, since it uses as much as digits as its factorization.

19987043853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951764003.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 19987043853 in words is "nineteen billion, nine hundred eighty-seven million, forty-three thousand, eight hundred fifty-three".