16676581 has 2 divisors, whose sum is σ = 16676582. Its totient is φ = 16676580.

The previous prime is 16676579. The next prime is 16676617. The reversal of 16676581 is 18567661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13468900 + 3207681 = 3670^2 + 1791^2 .

It is a cyclic number.

It is not a de Polignac number, because 16676581 - 2¹ = 16676579 is a prime.

It is a super-2 number, since 2×16676581² = 556216707699122, which contains 22 as substring.

Together with 16676579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16676521) 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, 8338290 + 8338291.

It is an arithmetic number, because the mean of its divisors is an integer number (8338291).

Almost surely, 2^16676581 is an apocalyptic number.

It is an amenable number.

16676581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16676581 is an equidigital number, since it uses as much as digits as its factorization.

16676581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 16676581 is about 4083.6969770050. The cubic root of 16676581 is about 255.4871170723.

The spelling of 16676581 in words is "sixteen million, six hundred seventy-six thousand, five hundred eighty-one".