19827244565 has 4 divisors (see below), whose sum is σ = 23792693484. Its totient is φ = 15861795648.

The previous prime is 19827244559. The next prime is 19827244583. The reversal of 19827244565 is 56544272891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2737173124 + 17090071441 = 52318^2 + 130729^2 .

It is a cyclic number.

It is not a de Polignac number, because 19827244565 - 2⁸ = 19827244309 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1982724452 + ... + 1982724461.

It is an arithmetic number, because the mean of its divisors is an integer number (5948173371).

Almost surely, 2^19827244565 is an apocalyptic number.

It is an amenable number.

19827244565 is a deficient number, since it is larger than the sum of its proper divisors (3965448919).

19827244565 is an equidigital number, since it uses as much as digits as its factorization.

19827244565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965448918.

The product of its digits is 4838400, while the sum is 53.

The spelling of 19827244565 in words is "nineteen billion, eight hundred twenty-seven million, two hundred forty-four thousand, five hundred sixty-five".