19225589561 has 4 divisors (see below), whose sum is σ = 20356506612. Its totient is φ = 18094672512.

The previous prime is 19225589543. The next prime is 19225589651. The reversal of 19225589561 is 16598552291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16598552291 = 157 ⋅105723263.

It can be written as a sum of positive squares in 2 ways, for example, as 6506035600 + 12719553961 = 80660^2 + 112781^2 .

It is a cyclic number.

It is not a de Polignac number, because 19225589561 - 2³⁰ = 18151847737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19225589161) 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, 565458500 + ... + 565458533.

It is an arithmetic number, because the mean of its divisors is an integer number (5089126653).

Almost surely, 2^19225589561 is an apocalyptic number.

It is an amenable number.

19225589561 is a deficient number, since it is larger than the sum of its proper divisors (1130917051).

19225589561 is a wasteful number, since it uses less digits than its factorization.

19225589561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130917050.

The product of its digits is 1944000, while the sum is 53.

The spelling of 19225589561 in words is "nineteen billion, two hundred twenty-five million, five hundred eighty-nine thousand, five hundred sixty-one".