491544913860 has 1728 divisors, whose sum is σ = 2192965286400. Its totient is φ = 88930068480.

The previous prime is 491544913829. The next prime is 491544913897. The reversal of 491544913860 is 68319445194.

491544913860 is a `hidden beast` number, since 4 + 9 + 1 + 5 + 449 + 138 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 491544913797 and 491544913806.

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 575 ways as a sum of consecutive naturals, for example, 2146484226 + ... + 2146484454.

Almost surely, 2^491544913860 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491544913860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096482643200).

491544913860 is an abundant number, since it is smaller than the sum of its proper divisors (1701420372540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491544913860 is a wasteful number, since it uses less digits than its factorization.

491544913860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 491544913860 in words is "four hundred ninety-one billion, five hundred forty-four million, nine hundred thirteen thousand, eight hundred sixty".