6516623 has 2 divisors, whose sum is σ = 6516624. Its totient is φ = 6516622.

The previous prime is 6516617. The next prime is 6516647. The reversal of 6516623 is 3266156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6516623 - 2¹⁶ = 6451087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6516673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258311 + 3258312.

It is an arithmetic number, because the mean of its divisors is an integer number (3258312).

Almost surely, 2^6516623 is an apocalyptic number.

6516623 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516623 is an equidigital number, since it uses as much as digits as its factorization.

6516623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 6516623 is about 2552.7677136786. The cubic root of 6516623 is about 186.7845135243.

The spelling of 6516623 in words is "six million, five hundred sixteen thousand, six hundred twenty-three".