19553728345 has 4 divisors (see below), whose sum is σ = 23464474020. Its totient is φ = 15642982672.

The previous prime is 19553728339. The next prime is 19553728393. The reversal of 19553728345 is 54382735591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54382735591 = 563 ⋅96594557.

It can be written as a sum of positive squares in 2 ways, for example, as 15424894809 + 4128833536 = 124197^2 + 64256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19553728345 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19553728292 and 19553728301.

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, 1955372830 + ... + 1955372839.

It is an arithmetic number, because the mean of its divisors is an integer number (5866118505).

Almost surely, 2^19553728345 is an apocalyptic number.

It is an amenable number.

19553728345 is a deficient number, since it is larger than the sum of its proper divisors (3910745675).

19553728345 is an equidigital number, since it uses as much as digits as its factorization.

19553728345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910745674.

The product of its digits is 4536000, while the sum is 52.

The spelling of 19553728345 in words is "nineteen billion, five hundred fifty-three million, seven hundred twenty-eight thousand, three hundred forty-five".