19726422897 has 4 divisors (see below), whose sum is σ = 26301897200. Its totient is φ = 13150948596.

The previous prime is 19726422887. The next prime is 19726422901. The reversal of 19726422897 is 79822462791.

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: 79822462791 = 3 ⋅26607487597.

It is not a de Polignac number, because 19726422897 - 2¹⁰ = 19726421873 is a prime.

It is a super-2 number, since 2×19726422897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19726422887) 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, 3287737147 + ... + 3287737152.

It is an arithmetic number, because the mean of its divisors is an integer number (6575474300).

Almost surely, 2^19726422897 is an apocalyptic number.

It is an amenable number.

19726422897 is a deficient number, since it is larger than the sum of its proper divisors (6575474303).

19726422897 is an equidigital number, since it uses as much as digits as its factorization.

19726422897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6575474302.

The product of its digits is 6096384, while the sum is 57.

The spelling of 19726422897 in words is "nineteen billion, seven hundred twenty-six million, four hundred twenty-two thousand, eight hundred ninety-seven".