491747730765 has 32 divisors (see below), whose sum is σ = 796799033856. Its totient is φ = 258935388480.

The previous prime is 491747730703. The next prime is 491747730769. The reversal of 491747730765 is 567037747194.

It is not a de Polignac number, because 491747730765 - 2¹⁹ = 491747206477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491747730699 and 491747730708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491747730769) by changing a digit.

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, 1777102 + ... + 2035088.

It is an arithmetic number, because the mean of its divisors is an integer number (24899969808).

Almost surely, 2^491747730765 is an apocalyptic number.

It is an amenable number.

491747730765 is a deficient number, since it is larger than the sum of its proper divisors (305051303091).

491747730765 is a wasteful number, since it uses less digits than its factorization.

491747730765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259609.

The product of its (nonzero) digits is 31116960, while the sum is 60.

The spelling of 491747730765 in words is "four hundred ninety-one billion, seven hundred forty-seven million, seven hundred thirty thousand, seven hundred sixty-five".