2166788005 has 4 divisors (see below), whose sum is σ = 2600145612. Its totient is φ = 1733430400.

The previous prime is 2166788003. The next prime is 2166788009. The reversal of 2166788005 is 5008876612.

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 249924481 + 1916863524 = 15809^2 + 43782^2 .

It is not a de Polignac number, because 2166788005 - 2¹ = 2166788003 is a prime.

It is a super-2 number, since 2×2166788005² = 9389940517223760050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166788003) 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, 216678796 + ... + 216678805.

It is an arithmetic number, because the mean of its divisors is an integer number (650036403).

Almost surely, 2^2166788005 is an apocalyptic number.

It is an amenable number.

2166788005 is a deficient number, since it is larger than the sum of its proper divisors (433357607).

2166788005 is an equidigital number, since it uses as much as digits as its factorization.

2166788005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433357606.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 2166788005 is about 46548.7701770949. The cubic root of 2166788005 is about 1294.0135011216.

The spelling of 2166788005 in words is "two billion, one hundred sixty-six million, seven hundred eighty-eight thousand, five".