2166373705 has 4 divisors (see below), whose sum is σ = 2599648452. Its totient is φ = 1733098960.

The previous prime is 2166373697. The next prime is 2166373753. The reversal of 2166373705 is 5073736612.

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 1381757584 + 784616121 = 37172^2 + 28011^2 .

It is not a de Polignac number, because 2166373705 - 2³ = 2166373697 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216637366 + ... + 216637375.

It is an arithmetic number, because the mean of its divisors is an integer number (649912113).

Almost surely, 2^2166373705 is an apocalyptic number.

It is an amenable number.

2166373705 is a deficient number, since it is larger than the sum of its proper divisors (433274747).

2166373705 is an equidigital number, since it uses as much as digits as its factorization.

2166373705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433274746.

The product of its (nonzero) digits is 158760, while the sum is 40.

The square root of 2166373705 is about 46544.3197930746. The cubic root of 2166373705 is about 1293.9310220536.

The spelling of 2166373705 in words is "two billion, one hundred sixty-six million, three hundred seventy-three thousand, seven hundred five".