19825985569 has 8 divisors (see below), whose sum is σ = 21375419240. Its totient is φ = 18280031616.

The previous prime is 19825985563. The next prime is 19825985617. The reversal of 19825985569 is 96558952891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1029575569 + 18796410000 = 32087^2 + 137100^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19825985569 - 2¹³ = 19825977377 is a prime.

It is a super-2 number, since 2×19825985569² (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 (19825985563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 858084 + ... + 880885.

It is an arithmetic number, because the mean of its divisors is an integer number (2671927405).

Almost surely, 2^19825985569 is an apocalyptic number.

It is an amenable number.

19825985569 is a deficient number, since it is larger than the sum of its proper divisors (1549433671).

19825985569 is a wasteful number, since it uses less digits than its factorization.

19825985569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739859.

The product of its digits is 69984000, while the sum is 67.

The spelling of 19825985569 in words is "nineteen billion, eight hundred twenty-five million, nine hundred eighty-five thousand, five hundred sixty-nine".