17520991479 has 12 divisors (see below), whose sum is σ = 25384562632. Its totient is φ = 11645370000.

The previous prime is 17520991447. The next prime is 17520991483. The reversal of 17520991479 is 97419902571.

17520991479 is a `hidden beast` number, since 17 + 520 + 99 + 14 + 7 + 9 = 666.

It is not a de Polignac number, because 17520991479 - 2⁵ = 17520991447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17520990479) 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, 2937772 + ... + 2943729.

Almost surely, 2^17520991479 is an apocalyptic number.

17520991479 is a deficient number, since it is larger than the sum of its proper divisors (7863571153).

17520991479 is a wasteful number, since it uses less digits than its factorization.

17520991479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5881838 (or 5881835 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The spelling of 17520991479 in words is "seventeen billion, five hundred twenty million, nine hundred ninety-one thousand, four hundred seventy-nine".