491640052936 has 16 divisors (see below), whose sum is σ = 921965655600. Its totient is φ = 245782544784.

The previous prime is 491640052867. The next prime is 491640052949. The reversal of 491640052936 is 639250046194.

It is a self number, because there is not a number n which added to its sum of digits gives 491640052936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4629426 + ... + 4734433.

It is an arithmetic number, because the mean of its divisors is an integer number (57622853475).

Almost surely, 2^491640052936 is an apocalyptic number.

It is an amenable number.

491640052936 is a deficient number, since it is larger than the sum of its proper divisors (430325602664).

491640052936 is a wasteful number, since it uses less digits than its factorization.

491640052936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9370428 (or 9370424 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 491640052936 in words is "four hundred ninety-one billion, six hundred forty million, fifty-two thousand, nine hundred thirty-six".