2166343951 has 2 divisors, whose sum is σ = 2166343952. Its totient is φ = 2166343950.

The previous prime is 2166343909. The next prime is 2166343967. The reversal of 2166343951 is 1593436612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2166343951 - 2¹⁵ = 2166311183 is a prime.

It is a super-2 number, since 2×2166343951² = 9386092228068580802, 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, 1083171975 + 1083171976.

It is an arithmetic number, because the mean of its divisors is an integer number (1083171976).

Almost surely, 2^2166343951 is an apocalyptic number.

2166343951 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166343951 is an equidigital number, since it uses as much as digits as its factorization.

2166343951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 2166343951 is about 46544.0001611378. Note that the first 3 decimals coincide. The cubic root of 2166343951 is about 1293.9250982065.

The spelling of 2166343951 in words is "two billion, one hundred sixty-six million, three hundred forty-three thousand, nine hundred fifty-one".