491817718194 has 64 divisors (see below), whose sum is σ = 1105603679232. Its totient is φ = 144541195200.

The previous prime is 491817718177. The next prime is 491817718279.

491817718194 is nontrivially palindromic in base 10.

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 31 ways as a sum of consecutive naturals, for example, 435669 + ... + 1083255.

It is an arithmetic number, because the mean of its divisors is an integer number (17275057488).

Almost surely, 2^491817718194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491817718194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (552801839616).

491817718194 is an abundant number, since it is smaller than the sum of its proper divisors (613785961038).

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

491817718194 is a wasteful number, since it uses less digits than its factorization.

491817718194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647951.

The product of its digits is 4064256, while the sum is 60.

The spelling of 491817718194 in words is "four hundred ninety-one billion, eight hundred seventeen million, seven hundred eighteen thousand, one hundred ninety-four".