2605663 has 2 divisors, whose sum is σ = 2605664. Its totient is φ = 2605662.

The previous prime is 2605661. The next prime is 2605741. The reversal of 2605663 is 3665062.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2605663 - 2¹ = 2605661 is a prime.

Together with 2605661, it forms a pair of twin primes.

2605663 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2605661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302831 + 1302832.

It is an arithmetic number, because the mean of its divisors is an integer number (1302832).

2^2605663 is an apocalyptic number.

2605663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2605663 is an equidigital number, since it uses as much as digits as its factorization.

2605663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 2605663 is about 1614.2066162670. The cubic root of 2605663 is about 137.6066478389.

The spelling of 2605663 in words is "two million, six hundred five thousand, six hundred sixty-three".