491559579604 has 24 divisors (see below), whose sum is σ = 883345151528. Its totient is φ = 239258327040.

The previous prime is 491559579557. The next prime is 491559579629. The reversal of 491559579604 is 406975955194.

It can be written as a sum of positive squares in 4 ways, for example, as 91627290000 + 399932289604 = 302700^2 + 632402^2 .

It is a super-3 number, since 3×491559579604³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10360809 + ... + 10408144.

Almost surely, 2^491559579604 is an apocalyptic number.

It is an amenable number.

491559579604 is a deficient number, since it is larger than the sum of its proper divisors (391785571924).

491559579604 is a wasteful number, since it uses less digits than its factorization.

491559579604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20769115 (or 20769113 counting only the distinct ones).

The product of its (nonzero) digits is 61236000, while the sum is 64.

The spelling of 491559579604 in words is "four hundred ninety-one billion, five hundred fifty-nine million, five hundred seventy-nine thousand, six hundred four".