2168809655 has 4 divisors (see below), whose sum is σ = 2602571592. Its totient is φ = 1735047720.

The previous prime is 2168809627. The next prime is 2168809681. The reversal of 2168809655 is 5569088612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2168809655 - 2²⁶ = 2101700791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216880961 + ... + 216880970.

It is an arithmetic number, because the mean of its divisors is an integer number (650642898).

Almost surely, 2^2168809655 is an apocalyptic number.

2168809655 is a deficient number, since it is larger than the sum of its proper divisors (433761937).

2168809655 is an equidigital number, since it uses as much as digits as its factorization.

2168809655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433761936.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The square root of 2168809655 is about 46570.4805107270. The cubic root of 2168809655 is about 1294.4158215465.

The spelling of 2168809655 in words is "two billion, one hundred sixty-eight million, eight hundred nine thousand, six hundred fifty-five".