19530078817 has 8 divisors (see below), whose sum is σ = 19837472040. Its totient is φ = 19224921600.

The previous prime is 19530078811. The next prime is 19530078863. The reversal of 19530078817 is 71887003591.

It can be written as a sum of positive squares in 4 ways, for example, as 17211078481 + 2319000336 = 131191^2 + 48156^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19530078817 - 2³¹ = 17382595169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19530078811) 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, 541392 + ... + 576337.

It is an arithmetic number, because the mean of its divisors is an integer number (2479684005).

Almost surely, 2^19530078817 is an apocalyptic number.

It is an amenable number.

19530078817 is a deficient number, since it is larger than the sum of its proper divisors (307393223).

19530078817 is a wasteful number, since it uses less digits than its factorization.

19530078817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118003.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 19530078817 in words is "nineteen billion, five hundred thirty million, seventy-eight thousand, eight hundred seventeen".