19818672017 has 2 divisors, whose sum is σ = 19818672018. Its totient is φ = 19818672016.

The previous prime is 19818671987. The next prime is 19818672047. The reversal of 19818672017 is 71027681891.

It is a balanced prime because it is at equal distance from previous prime (19818671987) and next prime (19818672047).

It can be written as a sum of positive squares in only one way, i.e., 12018956161 + 7799715856 = 109631^2 + 88316^2 .

It is a cyclic number.

It is not a de Polignac number, because 19818672017 - 2⁶ = 19818671953 is a prime.

It is not a weakly prime, because it can be changed into another prime (19818672047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9909336008 + 9909336009.

It is an arithmetic number, because the mean of its divisors is an integer number (9909336009).

Almost surely, 2^19818672017 is an apocalyptic number.

It is an amenable number.

19818672017 is a deficient number, since it is larger than the sum of its proper divisors (1).

19818672017 is an equidigital number, since it uses as much as digits as its factorization.

19818672017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 50.

The spelling of 19818672017 in words is "nineteen billion, eight hundred eighteen million, six hundred seventy-two thousand, seventeen".