491997558600 has 192 divisors, whose sum is σ = 1768339497600. Its totient is φ = 125494997760.

The previous prime is 491997558557. The next prime is 491997558667. The reversal of 491997558600 is 6855799194.

491997558600 is a `hidden beast` number, since 4 + 9 + 19 + 9 + 7 + 5 + 5 + 8 + 600 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1856467 + ... + 2104866.

It is an arithmetic number, because the mean of its divisors is an integer number (9210101550).

Almost surely, 2^491997558600 is an apocalyptic number.

491997558600 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491997558600 is an abundant number, since it is smaller than the sum of its proper divisors (1276341939000).

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

491997558600 is a wasteful number, since it uses less digits than its factorization.

491997558600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961381 (or 3961366 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 63.

The spelling of 491997558600 in words is "four hundred ninety-one billion, nine hundred ninety-seven million, five hundred fifty-eight thousand, six hundred".