491566449924 has 135 divisors (see below), whose sum is σ = 1412893963173. Its totient is φ = 148917463200.

The previous prime is 491566449901. The next prime is 491566449929. The reversal of 491566449924 is 429944665194.

It is a happy number.

The square root of 491566449924 is 701118.

It is a perfect power (a square), and thus also a powerful number.

491566449924 is a `hidden beast` number, since 4 + 9 + 1 + 566 + 4 + 49 + 9 + 24 = 666.

It can be written as a sum of positive squares in only one way, i.e., 205769289924 + 285797160000 = 453618^2 + 534600^2 .

It is not an unprimeable number, because it can be changed into a prime (491566449929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 138819594 + ... + 138823134.

Almost surely, 2^491566449924 is an apocalyptic number.

491566449924 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

491566449924 is the 701118-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491566449924

491566449924 is an abundant number, since it is smaller than the sum of its proper divisors (921327513249).

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

491566449924 is an equidigital number, since it uses as much as digits as its factorization.

491566449924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7120 (or 3557 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 63.

The spelling of 491566449924 in words is "four hundred ninety-one billion, five hundred sixty-six million, four hundred forty-nine thousand, nine hundred twenty-four".