16666423 has 2 divisors, whose sum is σ = 16666424. Its totient is φ = 16666422.

The previous prime is 16666417. The next prime is 16666453. The reversal of 16666423 is 32466661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16666423 - 2⁹ = 16665911 is a prime.

It is a super-2 number, since 2×16666423² = 555539311229858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16666453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333211 + 8333212.

It is an arithmetic number, because the mean of its divisors is an integer number (8333212).

Almost surely, 2^16666423 is an apocalyptic number.

16666423 is a deficient number, since it is larger than the sum of its proper divisors (1).

16666423 is an equidigital number, since it uses as much as digits as its factorization.

16666423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 34.

The square root of 16666423 is about 4082.4530615795. The cubic root of 16666423 is about 255.4352326314.

The spelling of 16666423 in words is "sixteen million, six hundred sixty-six thousand, four hundred twenty-three".