2166471789 has 32 divisors (see below), whose sum is σ = 3224033280. Its totient is φ = 1286007552.

The previous prime is 2166471779. The next prime is 2166471809. The reversal of 2166471789 is 9871746612.

It is not a de Polignac number, because 2166471789 - 2⁷ = 2166471661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166471719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1067794 + ... + 1069820.

It is an arithmetic number, because the mean of its divisors is an integer number (100751040).

Almost surely, 2^2166471789 is an apocalyptic number.

It is an amenable number.

2166471789 is a deficient number, since it is larger than the sum of its proper divisors (1057561491).

2166471789 is a wasteful number, since it uses less digits than its factorization.

2166471789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169.

The product of its digits is 1016064, while the sum is 51.

The square root of 2166471789 is about 46545.3734435551. The cubic root of 2166471789 is about 1293.9505496194.

The spelling of 2166471789 in words is "two billion, one hundred sixty-six million, four hundred seventy-one thousand, seven hundred eighty-nine".