17715478489 has 2 divisors, whose sum is σ = 17715478490. Its totient is φ = 17715478488.

The previous prime is 17715478427. The next prime is 17715478493. The reversal of 17715478489 is 98487451771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13198563225 + 4516915264 = 114885^2 + 67208^2 .

It is a cyclic number.

It is not a de Polignac number, because 17715478489 - 2⁹ = 17715477977 is a prime.

It is not a weakly prime, because it can be changed into another prime (17715478409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8857739244 + 8857739245.

It is an arithmetic number, because the mean of its divisors is an integer number (8857739245).

Almost surely, 2^17715478489 is an apocalyptic number.

It is an amenable number.

17715478489 is a deficient number, since it is larger than the sum of its proper divisors (1).

17715478489 is an equidigital number, since it uses as much as digits as its factorization.

17715478489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15805440, while the sum is 61.

The spelling of 17715478489 in words is "seventeen billion, seven hundred fifteen million, four hundred seventy-eight thousand, four hundred eighty-nine".