2168686685 has 32 divisors (see below), whose sum is σ = 3103017984. Its totient is φ = 1436544000.

The previous prime is 2168686679. The next prime is 2168686769. The reversal of 2168686685 is 5866868612.

It is not a de Polignac number, because 2168686685 - 2⁴ = 2168686669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2168686685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8426 + ... + 66395.

It is an arithmetic number, because the mean of its divisors is an integer number (96969312).

Almost surely, 2^2168686685 is an apocalyptic number.

It is an amenable number.

2168686685 is a deficient number, since it is larger than the sum of its proper divisors (934331299).

2168686685 is a wasteful number, since it uses less digits than its factorization.

2168686685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74885.

The product of its digits is 6635520, while the sum is 56.

The square root of 2168686685 is about 46569.1602350740. The cubic root of 2168686685 is about 1294.3913569250.

The spelling of 2168686685 in words is "two billion, one hundred sixty-eight million, six hundred eighty-six thousand, six hundred eighty-five".