19547473697 has 4 divisors (see below), whose sum is σ = 19548706836. Its totient is φ = 19546240560.

The previous prime is 19547473679. The next prime is 19547473723. The reversal of 19547473697 is 79637474591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79637474591 = 47 ⋅1694414353.

It can be written as a sum of positive squares in 2 ways, for example, as 337236496 + 19210237201 = 18364^2 + 138601^2 .

It is a cyclic number.

It is not a de Polignac number, because 19547473697 - 2¹⁶ = 19547408161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19547470697) 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, 592478 + ... + 624599.

It is an arithmetic number, because the mean of its divisors is an integer number (4887176709).

Almost surely, 2^19547473697 is an apocalyptic number.

It is an amenable number.

19547473697 is a deficient number, since it is larger than the sum of its proper divisors (1233139).

19547473697 is a wasteful number, since it uses less digits than its factorization.

19547473697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233138.

The product of its digits is 40007520, while the sum is 62.

The spelling of 19547473697 in words is "nineteen billion, five hundred forty-seven million, four hundred seventy-three thousand, six hundred ninety-seven".