16666423271 has 2 divisors, whose sum is σ = 16666423272. Its totient is φ = 16666423270.

The previous prime is 16666423219. The next prime is 16666423273. The reversal of 16666423271 is 17232466661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16666423271 is a prime.

Together with 16666423273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16666423273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333211635 + 8333211636.

It is an arithmetic number, because the mean of its divisors is an integer number (8333211636).

Almost surely, 2^16666423271 is an apocalyptic number.

16666423271 is a deficient number, since it is larger than the sum of its proper divisors (1).

16666423271 is an equidigital number, since it uses as much as digits as its factorization.

16666423271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The spelling of 16666423271 in words is "sixteen billion, six hundred sixty-six million, four hundred twenty-three thousand, two hundred seventy-one".