491217678068 has 24 divisors (see below), whose sum is σ = 937474836480. Its totient is φ = 223846028640.

The previous prime is 491217678043. The next prime is 491217678101. The reversal of 491217678068 is 860876712194.

It is a junction number, because it is equal to n+sod(n) for n = 491217677998 and 491217678016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59783828 + ... + 59792043.

It is an arithmetic number, because the mean of its divisors is an integer number (39061451520).

Almost surely, 2^491217678068 is an apocalyptic number.

It is an amenable number.

491217678068 is a deficient number, since it is larger than the sum of its proper divisors (446257158412).

491217678068 is a wasteful number, since it uses less digits than its factorization.

491217678068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119575967 (or 119575965 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 491217678068 in words is "four hundred ninety-one billion, two hundred seventeen million, six hundred seventy-eight thousand, sixty-eight".