491107172785 has 8 divisors (see below), whose sum is σ = 590590555776. Its totient is φ = 392044439280.

The previous prime is 491107172737. The next prime is 491107172863. The reversal of 491107172785 is 587271701194.

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

It is not a de Polignac number, because 491107172785 - 2¹¹ = 491107170737 is a prime.

It is a Duffinian 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, 105159801 + ... + 105164470.

It is an arithmetic number, because the mean of its divisors is an integer number (73823819472).

Almost surely, 2^491107172785 is an apocalyptic number.

It is an amenable number.

491107172785 is a deficient number, since it is larger than the sum of its proper divisors (99483382991).

491107172785 is a wasteful number, since it uses less digits than its factorization.

491107172785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210324743.

The product of its (nonzero) digits is 987840, while the sum is 52.

The spelling of 491107172785 in words is "four hundred ninety-one billion, one hundred seven million, one hundred seventy-two thousand, seven hundred eighty-five".