491103363840 has 144 divisors (see below), whose sum is σ = 1580435974656. Its totient is φ = 129961062400.

The previous prime is 491103363809. The next prime is 491103363859. The reversal of 491103363840 is 48363301194.

It is a junction number, because it is equal to n+sod(n) for n = 491103363792 and 491103363801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14905 + ... + 991175.

It is an arithmetic number, because the mean of its divisors is an integer number (10975249824).

Almost surely, 2^491103363840 is an apocalyptic number.

491103363840 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 491103363840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790217987328).

491103363840 is an abundant number, since it is smaller than the sum of its proper divisors (1089332610816).

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

491103363840 is a wasteful number, since it uses less digits than its factorization.

491103363840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976426 (or 976412 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 491103363840 in words is "four hundred ninety-one billion, one hundred three million, three hundred sixty-three thousand, eight hundred forty".