2168840655 has 24 divisors (see below), whose sum is σ = 3860930112. Its totient is φ = 1125451584.

The previous prime is 2168840647. The next prime is 2168840669. The reversal of 2168840655 is 5560488612.

It is not a de Polignac number, because 2168840655 - 2³ = 2168840647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2168840655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649639 + ... + 652968.

It is an arithmetic number, because the mean of its divisors is an integer number (160872088).

Almost surely, 2^2168840655 is an apocalyptic number.

2168840655 is a deficient number, since it is larger than the sum of its proper divisors (1692089457).

2168840655 is a wasteful number, since it uses less digits than its factorization.

2168840655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302655 (or 1302652 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 2168840655 is about 46570.8133383990. The cubic root of 2168840655 is about 1294.4219887850.

The spelling of 2168840655 in words is "two billion, one hundred sixty-eight million, eight hundred forty thousand, six hundred fifty-five".