19847547017 has 18 divisors (see below), whose sum is σ = 20782929258. Its totient is φ = 18952002048.

The previous prime is 19847547001. The next prime is 19847547037. The reversal of 19847547017 is 71074574891.

It can be written as a sum of positive squares in 9 ways, for example, as 1574184976 + 18273362041 = 39676^2 + 135179^2 .

It is not a de Polignac number, because 19847547017 - 2⁴ = 19847547001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19847547017.

It is not an unprimeable number, because it can be changed into a prime (19847547037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 43429853 + ... + 43430309.

It is an arithmetic number, because the mean of its divisors is an integer number (1154607181).

Almost surely, 2^19847547017 is an apocalyptic number.

It is an amenable number.

19847547017 is a deficient number, since it is larger than the sum of its proper divisors (935382241).

19847547017 is an frugal number, since it uses more digits than its factorization.

19847547017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 53.

The spelling of 19847547017 in words is "nineteen billion, eight hundred forty-seven million, five hundred forty-seven thousand, seventeen".