16671643 has 2 divisors, whose sum is σ = 16671644. Its totient is φ = 16671642.

The previous prime is 16671631. The next prime is 16671647. The reversal of 16671643 is 34617661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16671643 - 2¹⁷ = 16540571 is a prime.

It is a super-3 number, since 3×16671643³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16671599 and 16671608.

It is not a weakly prime, because it can be changed into another prime (16671647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8335821 + 8335822.

It is an arithmetic number, because the mean of its divisors is an integer number (8335822).

Almost surely, 2^16671643 is an apocalyptic number.

16671643 is a deficient number, since it is larger than the sum of its proper divisors (1).

16671643 is an equidigital number, since it uses as much as digits as its factorization.

16671643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 16671643 is about 4083.0923330241. The cubic root of 16671643 is about 255.4618976758.

The spelling of 16671643 in words is "sixteen million, six hundred seventy-one thousand, six hundred forty-three".