491847658848 has 144 divisors (see below), whose sum is σ = 1721466897696. Its totient is φ = 129718056960.

The previous prime is 491847658847. The next prime is 491847658873. The reversal of 491847658848 is 848856748194.

It is a happy number.

491847658848 is a `hidden beast` number, since 491 + 8 + 4 + 7 + 6 + 58 + 84 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491847658843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9357333 + ... + 9409748.

It is an arithmetic number, because the mean of its divisors is an integer number (11954631234).

Almost surely, 2^491847658848 is an apocalyptic number.

491847658848 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

491847658848 is an abundant number, since it is smaller than the sum of its proper divisors (1229619238848).

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

491847658848 is a wasteful number, since it uses less digits than its factorization.

491847658848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18767117 (or 18767106 counting only the distinct ones).

The product of its digits is 495452160, while the sum is 72.

The spelling of 491847658848 in words is "four hundred ninety-one billion, eight hundred forty-seven million, six hundred fifty-eight thousand, eight hundred forty-eight".