491030777808 has 200 divisors, whose sum is σ = 1442489121216. Its totient is φ = 161227584000.

The previous prime is 491030777777. The next prime is 491030777813. The reversal of 491030777808 is 808777030194.

491030777808 is a `hidden beast` number, since 491 + 0 + 3 + 0 + 7 + 77 + 80 + 8 = 666.

It is a super-2 number, since 2×491030777808² (a number of 24 digits) contains 22 as substring.

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, 165719335 + ... + 165722297.

Almost surely, 2^491030777808 is an apocalyptic number.

491030777808 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 491030777808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721244560608).

491030777808 is an abundant number, since it is smaller than the sum of its proper divisors (951458343408).

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

491030777808 is a wasteful number, since it uses less digits than its factorization.

491030777808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4855 (or 4840 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 491030777808 in words is "four hundred ninety-one billion, thirty million, seven hundred seventy-seven thousand, eight hundred eight".