2166406043 has 2 divisors, whose sum is σ = 2166406044. Its totient is φ = 2166406042.

The previous prime is 2166406013. The next prime is 2166406097. The reversal of 2166406043 is 3406046612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166406043 - 2¹⁶ = 2166340507 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166406003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083203021 + 1083203022.

It is an arithmetic number, because the mean of its divisors is an integer number (1083203022).

Almost surely, 2^2166406043 is an apocalyptic number.

2166406043 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166406043 is an equidigital number, since it uses as much as digits as its factorization.

2166406043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 2166406043 is about 46544.6671811068. The cubic root of 2166406043 is about 1293.9374602985.

The spelling of 2166406043 in words is "two billion, one hundred sixty-six million, four hundred six thousand, forty-three".