2166433655 has 4 divisors (see below), whose sum is σ = 2599720392. Its totient is φ = 1733146920.

The previous prime is 2166433589. The next prime is 2166433673. The reversal of 2166433655 is 5563346612.

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

It is not a de Polignac number, because 2166433655 - 2¹⁶ = 2166368119 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, 216643361 + ... + 216643370.

It is an arithmetic number, because the mean of its divisors is an integer number (649930098).

Almost surely, 2^2166433655 is an apocalyptic number.

2166433655 is a deficient number, since it is larger than the sum of its proper divisors (433286737).

2166433655 is an equidigital number, since it uses as much as digits as its factorization.

2166433655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433286736.

The product of its digits is 388800, while the sum is 41.

The square root of 2166433655 is about 46544.9637984605. The cubic root of 2166433655 is about 1293.9429575827.

The spelling of 2166433655 in words is "two billion, one hundred sixty-six million, four hundred thirty-three thousand, six hundred fifty-five".