17919780163 has 2 divisors, whose sum is σ = 17919780164. Its totient is φ = 17919780162.

The previous prime is 17919780143. The next prime is 17919780181. The reversal of 17919780163 is 36108791971.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17919780163 - 2¹³ = 17919771971 is a prime.

It is a super-2 number, since 2×17919780163² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 17919780163.

It is not a weakly prime, because it can be changed into another prime (17919780143) 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 as a sum of consecutive naturals, namely, 8959890081 + 8959890082.

It is an arithmetic number, because the mean of its divisors is an integer number (8959890082).

Almost surely, 2^17919780163 is an apocalyptic number.

17919780163 is a deficient number, since it is larger than the sum of its proper divisors (1).

17919780163 is an equidigital number, since it uses as much as digits as its factorization.

17919780163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 52.

The spelling of 17919780163 in words is "seventeen billion, nine hundred nineteen million, seven hundred eighty thousand, one hundred sixty-three".