2166343937 has 4 divisors (see below), whose sum is σ = 2219181636. Its totient is φ = 2113506240.

The previous prime is 2166343909. The next prime is 2166343951. The reversal of 2166343937 is 7393436612.

It is a Cunningham number, because it is equal to 46544²+1.

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 104366656 + 2061977281 = 10216^2 + 45409^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166343937 - 2²⁰ = 2165295361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166343967) 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, 26418788 + ... + 26418869.

It is an arithmetic number, because the mean of its divisors is an integer number (554795409).

Almost surely, 2^2166343937 is an apocalyptic number.

It is an amenable number.

2166343937 is a deficient number, since it is larger than the sum of its proper divisors (52837699).

2166343937 is an equidigital number, since it uses as much as digits as its factorization.

2166343937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52837698.

The product of its digits is 489888, while the sum is 44.

The square root of 2166343937 is about 46544.0000107425. Note that the first 4 decimals coincide. The cubic root of 2166343937 is about 1293.9250954191.

The spelling of 2166343937 in words is "two billion, one hundred sixty-six million, three hundred forty-three thousand, nine hundred thirty-seven".