1688116686 has 16 divisors (see below), whose sum is σ = 3385289424. Its totient is φ = 561196224.

The previous prime is 1688116679. The next prime is 1688116699. The reversal of 1688116686 is 6866118861.

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, 374911 + ... + 379386.

It is an arithmetic number, because the mean of its divisors is an integer number (211580589).

Almost surely, 2^1688116686 is an apocalyptic number.

1688116686 is an abundant number, since it is smaller than the sum of its proper divisors (1697172738).

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

1688116686 is a wasteful number, since it uses less digits than its factorization.

1688116686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754675.

The product of its digits is 663552, while the sum is 51.

The square root of 1688116686 is about 41086.6971902099. The cubic root of 1688116686 is about 1190.6957976845.

The spelling of 1688116686 in words is "one billion, six hundred eighty-eight million, one hundred sixteen thousand, six hundred eighty-six".