491647036608 has 672 divisors, whose sum is σ = 1817660779200. Its totient is φ = 129164378112.

The previous prime is 491647036607. The next prime is 491647036613. The reversal of 491647036608 is 806630746194.

491647036608 is a `hidden beast` number, since 491 + 64 + 7 + 0 + 36 + 60 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

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

It is not an unprimeable number, because it can be changed into a prime (491647036607) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 348932608 + ... + 348934016.

It is an arithmetic number, because the mean of its divisors is an integer number (2704852350).

Almost surely, 2^491647036608 is an apocalyptic number.

491647036608 is a gapful number since it is divisible by the number (48) 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 491647036608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (908830389600).

491647036608 is an abundant number, since it is smaller than the sum of its proper divisors (1326013742592).

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

491647036608 is a wasteful number, since it uses less digits than its factorization.

491647036608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 491647036608 in words is "four hundred ninety-one billion, six hundred forty-seven million, thirty-six thousand, six hundred eight".