17205909449 has 2 divisors, whose sum is σ = 17205909450. Its totient is φ = 17205909448.

The previous prime is 17205909433. The next prime is 17205909499. The reversal of 17205909449 is 94490950271.

It is an a-pointer prime, because the next prime (17205909499) can be obtained adding 17205909449 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15583028224 + 1622881225 = 124832^2 + 40285^2 .

It is a cyclic number.

It is not a de Polignac number, because 17205909449 - 2⁴ = 17205909433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17205909397 and 17205909406.

It is not a weakly prime, because it can be changed into another prime (17205909499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8602954724 + 8602954725.

It is an arithmetic number, because the mean of its divisors is an integer number (8602954725).

Almost surely, 2^17205909449 is an apocalyptic number.

It is an amenable number.

17205909449 is a deficient number, since it is larger than the sum of its proper divisors (1).

17205909449 is an equidigital number, since it uses as much as digits as its factorization.

17205909449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 17205909449 in words is "seventeen billion, two hundred five million, nine hundred nine thousand, four hundred forty-nine".