17819049825 has 18 divisors (see below), whose sum is σ = 31915898534. Its totient is φ = 9503493120.

The previous prime is 17819049823. The next prime is 17819049839. The reversal of 17819049825 is 52894091871.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1933976529 + 15885073296 = 43977^2 + 126036^2 .

It is not a de Polignac number, because 17819049825 - 2¹ = 17819049823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17819049823) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 39597664 + ... + 39598113.

Almost surely, 2^17819049825 is an apocalyptic number.

17819049825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17819049825 is a deficient number, since it is larger than the sum of its proper divisors (14096848709).

17819049825 is a wasteful number, since it uses less digits than its factorization.

17819049825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79195793 (or 79195785 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 17819049825 in words is "seventeen billion, eight hundred nineteen million, forty-nine thousand, eight hundred twenty-five".