13663775 has 12 divisors (see below), whose sum is σ = 17177472. Its totient is φ = 10779840.

The previous prime is 13663763. The next prime is 13663781. The reversal of 13663775 is 57736631.

It is not a de Polignac number, because 13663775 - 2¹⁰ = 13662751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1919 + ... + 5568.

It is an arithmetic number, because the mean of its divisors is an integer number (1431456).

Almost surely, 2^13663775 is an apocalyptic number.

13663775 is a deficient number, since it is larger than the sum of its proper divisors (3513697).

13663775 is an equidigital number, since it uses as much as digits as its factorization.

13663775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7570 (or 7565 counting only the distinct ones).

The product of its digits is 79380, while the sum is 38.

The square root of 13663775 is about 3696.4543822425. The cubic root of 13663775 is about 239.0691664452.

The spelling of 13663775 in words is "thirteen million, six hundred sixty-three thousand, seven hundred seventy-five".