491639469184 has 64 divisors (see below), whose sum is σ = 1034241321600. Its totient is φ = 232146846720.

The previous prime is 491639469163. The next prime is 491639469199. The reversal of 491639469184 is 481964936194.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452089 + ... + 1089799.

It is an arithmetic number, because the mean of its divisors is an integer number (16160020650).

Almost surely, 2^491639469184 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 491639469184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (517120660800).

491639469184 is an abundant number, since it is smaller than the sum of its proper divisors (542601852416).

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

491639469184 is a wasteful number, since it uses less digits than its factorization.

491639469184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638061 (or 638049 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 64.

The spelling of 491639469184 in words is "four hundred ninety-one billion, six hundred thirty-nine million, four hundred sixty-nine thousand, one hundred eighty-four".