19105443853 has 4 divisors (see below), whose sum is σ = 19108165120. Its totient is φ = 19102722588.

The previous prime is 19105443827. The next prime is 19105443949. The reversal of 19105443853 is 35834450191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35834450191 = 2897 ⋅12369503.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19105443853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19105443823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350075 + ... + 1364152.

It is an arithmetic number, because the mean of its divisors is an integer number (4777041280).

Almost surely, 2^19105443853 is an apocalyptic number.

It is an amenable number.

19105443853 is a deficient number, since it is larger than the sum of its proper divisors (2721267).

19105443853 is an equidigital number, since it uses as much as digits as its factorization.

19105443853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721266.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 19105443853 in words is "nineteen billion, one hundred five million, four hundred forty-three thousand, eight hundred fifty-three".