491986340659 has 8 divisors (see below), whose sum is σ = 543178786752. Its totient is φ = 441871630440.

The previous prime is 491986340611. The next prime is 491986340663. The reversal of 491986340659 is 956043689194.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491986340659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491986340659.

It is not an unprimeable number, because it can be changed into a prime (491986340159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269433009 + ... + 269434834.

It is an arithmetic number, because the mean of its divisors is an integer number (67897348344).

Almost surely, 2^491986340659 is an apocalyptic number.

491986340659 is a deficient number, since it is larger than the sum of its proper divisors (51192446093).

491986340659 is a wasteful number, since it uses less digits than its factorization.

491986340659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538867937.

The product of its (nonzero) digits is 50388480, while the sum is 64.

The spelling of 491986340659 in words is "four hundred ninety-one billion, nine hundred eighty-six million, three hundred forty thousand, six hundred fifty-nine".