491254502721840 has 2560 divisors, whose sum is σ = 2209624974950400. Its totient is φ = 98427985920000.

The previous prime is 491254502721799. The next prime is 491254502721863. The reversal of 491254502721840 is 48127205452194.

491254502721840 is a `hidden beast` number, since 4 + 9 + 1 + 2 + 5 + 450 + 2 + 7 + 2 + 184 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 9603980265 + ... + 9604031415.

It is an arithmetic number, because the mean of its divisors is an integer number (863134755840).

Almost surely, 2^{491254502721840} is an apocalyptic number.

491254502721840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491254502721840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104812487475200).

491254502721840 is an abundant number, since it is smaller than the sum of its proper divisors (1718370472228560).

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

491254502721840 is a wasteful number, since it uses less digits than its factorization.

491254502721840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51304 (or 51292 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 491254502721840 in words is "four hundred ninety-one trillion, two hundred fifty-four billion, five hundred two million, seven hundred twenty-one thousand, eight hundred forty".