17205909479 has 12 divisors (see below), whose sum is σ = 18931496640. Its totient is φ = 15625843200.

The previous prime is 17205909449. The next prime is 17205909499. The reversal of 17205909479 is 97490950271.

It is not a de Polignac number, because 17205909479 - 2⁸ = 17205909223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17205909479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17205909449) 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 in 11 ways as a sum of consecutive naturals, for example, 48167 + ... + 191655.

It is an arithmetic number, because the mean of its divisors is an integer number (1577624720).

Almost surely, 2^17205909479 is an apocalyptic number.

17205909479 is a deficient number, since it is larger than the sum of its proper divisors (1725587161).

17205909479 is a wasteful number, since it uses less digits than its factorization.

17205909479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144502 (or 144491 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 17205909479 in words is "seventeen billion, two hundred five million, nine hundred nine thousand, four hundred seventy-nine".