1999516686 has 8 divisors (see below), whose sum is σ = 3999033384. Its totient is φ = 666505560.

The previous prime is 1999516669. The next prime is 1999516747. The reversal of 1999516686 is 6866159991.

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

1999516686 is an admirable number.

It is a Curzon number.

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, 166626385 + ... + 166626396.

It is an arithmetic number, because the mean of its divisors is an integer number (499879173).

Almost surely, 2^1999516686 is an apocalyptic number.

1999516686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999516686 is a wasteful number, since it uses less digits than its factorization.

1999516686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333252786.

The product of its digits is 6298560, while the sum is 60.

The square root of 1999516686 is about 44715.9556087086. The cubic root of 1999516686 is about 1259.8195521382.

The spelling of 1999516686 in words is "one billion, nine hundred ninety-nine million, five hundred sixteen thousand, six hundred eighty-six".