991914585686 has 8 divisors (see below), whose sum is σ = 1487957770944. Its totient is φ = 495928662040.

The previous prime is 991914585677. The next prime is 991914585811. The reversal of 991914585686 is 686585419199.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14272070 + ... + 14341401.

It is an arithmetic number, because the mean of its divisors is an integer number (185994721368).

Almost surely, 2^991914585686 is an apocalyptic number.

991914585686 is a deficient number, since it is larger than the sum of its proper divisors (496043185258).

991914585686 is a wasteful number, since it uses less digits than its factorization.

991914585686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28630806.

The product of its digits is 167961600, while the sum is 71.

The spelling of 991914585686 in words is "nine hundred ninety-one billion, nine hundred fourteen million, five hundred eighty-five thousand, six hundred eighty-six".