19927342585 has 4 divisors (see below), whose sum is σ = 23912811108. Its totient is φ = 15941874064.

The previous prime is 19927342573. The next prime is 19927342607. The reversal of 19927342585 is 58524372991.

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 12099340009 + 7828002576 = 109997^2 + 88476^2 .

It is a cyclic number.

It is not a de Polignac number, because 19927342585 - 2⁹ = 19927342073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1992734254 + ... + 1992734263.

It is an arithmetic number, because the mean of its divisors is an integer number (5978202777).

Almost surely, 2^19927342585 is an apocalyptic number.

It is an amenable number.

19927342585 is a deficient number, since it is larger than the sum of its proper divisors (3985468523).

19927342585 is an equidigital number, since it uses as much as digits as its factorization.

19927342585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985468522.

The product of its digits is 5443200, while the sum is 55.

The spelling of 19927342585 in words is "nineteen billion, nine hundred twenty-seven million, three hundred forty-two thousand, five hundred eighty-five".