13665623 has 2 divisors, whose sum is σ = 13665624. Its totient is φ = 13665622.

The previous prime is 13665607. The next prime is 13665629. The reversal of 13665623 is 32656631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13665623 - 2⁴ = 13665607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13665623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13665629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6832811 + 6832812.

It is an arithmetic number, because the mean of its divisors is an integer number (6832812).

Almost surely, 2^13665623 is an apocalyptic number.

13665623 is a deficient number, since it is larger than the sum of its proper divisors (1).

13665623 is an equidigital number, since it uses as much as digits as its factorization.

13665623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 32.

The square root of 13665623 is about 3696.7043430602. The cubic root of 13665623 is about 239.0799438451.

The spelling of 13665623 in words is "thirteen million, six hundred sixty-five thousand, six hundred twenty-three".