19797551909159 has 2 divisors, whose sum is σ = 19797551909160. Its totient is φ = 19797551909158.

The previous prime is 19797551909123. The next prime is 19797551909287. The reversal of 19797551909159 is 95190915579791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19797551909159 - 2²⁰ = 19797550860583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19797551909159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19797551909659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9898775954579 + 9898775954580.

It is an arithmetic number, because the mean of its divisors is an integer number (9898775954580).

Almost surely, 2^{19797551909159} is an apocalyptic number.

19797551909159 is a deficient number, since it is larger than the sum of its proper divisors (1).

19797551909159 is an equidigital number, since it uses as much as digits as its factorization.

19797551909159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 361675125, while the sum is 77.

The spelling of 19797551909159 in words is "nineteen trillion, seven hundred ninety-seven billion, five hundred fifty-one million, nine hundred nine thousand, one hundred fifty-nine".