491437646336 has 160 divisors (see below), whose sum is σ = 1220981435520. Its totient is φ = 192408846336.

The previous prime is 491437646333. The next prime is 491437646363. The reversal of 491437646336 is 633646734194.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (491437646333) 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 15 ways as a sum of consecutive naturals, for example, 4465055 + ... + 4573793.

It is an arithmetic number, because the mean of its divisors is an integer number (7631133972).

Almost surely, 2^491437646336 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 491437646336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (610490717760).

491437646336 is an abundant number, since it is smaller than the sum of its proper divisors (729543789184).

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

491437646336 is a wasteful number, since it uses less digits than its factorization.

491437646336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108874 (or 108858 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 56.

The spelling of 491437646336 in words is "four hundred ninety-one billion, four hundred thirty-seven million, six hundred forty-six thousand, three hundred thirty-six".