2166973829 has 4 divisors (see below), whose sum is σ = 2196658476. Its totient is φ = 2137289184.

The previous prime is 2166973789. The next prime is 2166973841. The reversal of 2166973829 is 9283796612.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1528653604 + 638320225 = 39098^2 + 25265^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166973829 - 2²⁰ = 2165925253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166973729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14842214 + ... + 14842359.

It is an arithmetic number, because the mean of its divisors is an integer number (549164619).

Almost surely, 2^2166973829 is an apocalyptic number.

It is an amenable number.

2166973829 is a deficient number, since it is larger than the sum of its proper divisors (29684647).

2166973829 is an equidigital number, since it uses as much as digits as its factorization.

2166973829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29684646.

The product of its digits is 1959552, while the sum is 53.

The square root of 2166973829 is about 46550.7661483675. The cubic root of 2166973829 is about 1294.0504916487.

The spelling of 2166973829 in words is "two billion, one hundred sixty-six million, nine hundred seventy-three thousand, eight hundred twenty-nine".