2685987666 has 24 divisors (see below), whose sum is σ = 5823854400. Its totient is φ = 894680856.

The previous prime is 2685987659. The next prime is 2685987671. The reversal of 2685987666 is 6667895862.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28150 + ... + 78513.

It is an arithmetic number, because the mean of its divisors is an integer number (242660600).

Almost surely, 2^2685987666 is an apocalyptic number.

2685987666 is an abundant number, since it is smaller than the sum of its proper divisors (3137866734).

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

2685987666 is a wasteful number, since it uses less digits than its factorization.

2685987666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108070 (or 108067 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The square root of 2685987666 is about 51826.5150863918. The cubic root of 2685987666 is about 1390.0636007681.

The spelling of 2685987666 in words is "two billion, six hundred eighty-five million, nine hundred eighty-seven thousand, six hundred sixty-six".