491450491584 has 336 divisors, whose sum is σ = 1568482755840. Its totient is φ = 146100879360.

The previous prime is 491450491583. The next prime is 491450491589. The reversal of 491450491584 is 485194054194.

491450491584 is a `hidden beast` number, since 4 + 9 + 1 + 4 + 50 + 4 + 9 + 1 + 584 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 491450491584.

It is not an unprimeable number, because it can be changed into a prime (491450491583) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 187790244 + ... + 187792860.

It is an arithmetic number, because the mean of its divisors is an integer number (4668103440).

Almost surely, 2^491450491584 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 491450491584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784241377920).

491450491584 is an abundant number, since it is smaller than the sum of its proper divisors (1077032264256).

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

491450491584 is a wasteful number, since it uses less digits than its factorization.

491450491584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488 (or 3475 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 491450491584 in words is "four hundred ninety-one billion, four hundred fifty million, four hundred ninety-one thousand, five hundred eighty-four".