17581979012 has 24 divisors (see below), whose sum is σ = 33138928536. Its totient is φ = 8113863168.

The previous prime is 17581978993. The next prime is 17581979021. The reversal of 17581979012 is 21097918571.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 821051716 + 16760927296 = 28654^2 + 129464^2 .

It is a super-2 number, since 2×17581979012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790508 + ... + 812444.

It is an arithmetic number, because the mean of its divisors is an integer number (1380788689).

Almost surely, 2^17581979012 is an apocalyptic number.

It is an amenable number.

17581979012 is a deficient number, since it is larger than the sum of its proper divisors (15556949524).

17581979012 is a wasteful number, since it uses less digits than its factorization.

17581979012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37367 (or 37365 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 50.

The spelling of 17581979012 in words is "seventeen billion, five hundred eighty-one million, nine hundred seventy-nine thousand, twelve".