2166343909 has 2 divisors, whose sum is σ = 2166343910. Its totient is φ = 2166343908.

The previous prime is 2166343901. The next prime is 2166343951. The reversal of 2166343909 is 9093436612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341390625 + 824953284 = 36625^2 + 28722^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166343909 - 2³ = 2166343901 is a prime.

It is a super-2 number, since 2×2166343909² = 9386091864122800562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166343901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083171954 + 1083171955.

It is an arithmetic number, because the mean of its divisors is an integer number (1083171955).

Almost surely, 2^2166343909 is an apocalyptic number.

It is an amenable number.

2166343909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166343909 is an equidigital number, since it uses as much as digits as its factorization.

2166343909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 2166343909 is about 46543.9997099519. Note that the first 3 decimals coincide. The cubic root of 2166343909 is about 1293.9250898445.

The spelling of 2166343909 in words is "two billion, one hundred sixty-six million, three hundred forty-three thousand, nine hundred nine".