491379460180866 has 64 divisors (see below), whose sum is σ = 1094041821882240. Its totient is φ = 163480157798400.

The previous prime is 491379460180841. The next prime is 491379460180933. The reversal of 491379460180866 is 668081064973194.

It is a happy number.

491379460180866 is a `hidden beast` number, since 4 + 9 + 1 + 3 + 7 + 9 + 4 + 601 + 8 + 0 + 8 + 6 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 491379460180794 and 491379460180803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140806146 + ... + 144253698.

It is an arithmetic number, because the mean of its divisors is an integer number (17094403466910).

Almost surely, 2^{491379460180866} is an apocalyptic number.

491379460180866 is an abundant number, since it is smaller than the sum of its proper divisors (602662361701374).

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

491379460180866 is a wasteful number, since it uses less digits than its factorization.

491379460180866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3452608 (or 3452602 counting only the distinct ones).

The product of its (nonzero) digits is 376233984, while the sum is 72.

The spelling of 491379460180866 in words is "four hundred ninety-one trillion, three hundred seventy-nine billion, four hundred sixty million, one hundred eighty thousand, eight hundred sixty-six".