13681663 has 2 divisors, whose sum is σ = 13681664. Its totient is φ = 13681662.

The previous prime is 13681643. The next prime is 13681667. The reversal of 13681663 is 36618631.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13681663 - 2²¹ = 11584511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13681667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6840831 + 6840832.

It is an arithmetic number, because the mean of its divisors is an integer number (6840832).

Almost surely, 2^13681663 is an apocalyptic number.

13681663 is a deficient number, since it is larger than the sum of its proper divisors (1).

13681663 is an equidigital number, since it uses as much as digits as its factorization.

13681663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 13681663 is about 3698.8732068023. The cubic root of 13681663 is about 239.1734471538.

The spelling of 13681663 in words is "thirteen million, six hundred eighty-one thousand, six hundred sixty-three".