16606813 has 2 divisors, whose sum is σ = 16606814. Its totient is φ = 16606812.

The previous prime is 16606801. The next prime is 16606831. The reversal of 16606813 is 31860661.

Together with next prime (16606831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14538969 + 2067844 = 3813^2 + 1438^2 .

It is a cyclic number.

It is not a de Polignac number, because 16606813 - 2⁵ = 16606781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16606853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8303406 + 8303407.

It is an arithmetic number, because the mean of its divisors is an integer number (8303407).

Almost surely, 2^16606813 is an apocalyptic number.

It is an amenable number.

16606813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16606813 is an equidigital number, since it uses as much as digits as its factorization.

16606813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 16606813 is about 4075.1457642641. The cubic root of 16606813 is about 255.1303345004.

The spelling of 16606813 in words is "sixteen million, six hundred six thousand, eight hundred thirteen".