1686081996 has 18 divisors (see below), whose sum is σ = 4262040692. Its totient is φ = 562027320.

The previous prime is 1686081979. The next prime is 1686082009. The reversal of 1686081996 is 6991806861.

1686081996 is a `hidden beast` number, since 16 + 8 + 608 + 19 + 9 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23417770 + ... + 23417841.

Almost surely, 2^1686081996 is an apocalyptic number.

It is an amenable number.

1686081996 is an abundant number, since it is smaller than the sum of its proper divisors (2575958696).

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

1686081996 is a wasteful number, since it uses less digits than its factorization.

1686081996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46835621 (or 46835616 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 1686081996 is about 41061.9287905476. The cubic root of 1686081996 is about 1190.2172227801.

The spelling of 1686081996 in words is "one billion, six hundred eighty-six million, eighty-one thousand, nine hundred ninety-six".