491544913806 has 80 divisors (see below), whose sum is σ = 1140035505840. Its totient is φ = 158110807680.

The previous prime is 491544913789. The next prime is 491544913813. The reversal of 491544913806 is 608319445194.

491544913806 is a `hidden beast` number, since 4 + 9 + 1 + 544 + 9 + 13 + 80 + 6 = 666.

491544913806 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8743146 + ... + 8799186.

It is an arithmetic number, because the mean of its divisors is an integer number (14250443823).

Almost surely, 2^491544913806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491544913806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (570017752920).

491544913806 is an abundant number, since it is smaller than the sum of its proper divisors (648490592034).

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

491544913806 is a wasteful number, since it uses less digits than its factorization.

491544913806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57951 (or 57942 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 491544913806 in words is "four hundred ninety-one billion, five hundred forty-four million, nine hundred thirteen thousand, eight hundred six".