13315665 has 16 divisors (see below), whose sum is σ = 23242176. Its totient is φ = 6456000.

The previous prime is 13315661. The next prime is 13315691. The reversal of 13315665 is 56651331.

13315665 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13315665 - 2² = 13315661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13315661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40186 + ... + 40515.

It is an arithmetic number, because the mean of its divisors is an integer number (1452636).

Almost surely, 2^13315665 is an apocalyptic number.

13315665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13315665 is a deficient number, since it is larger than the sum of its proper divisors (9926511).

13315665 is a wasteful number, since it uses less digits than its factorization.

13315665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80720.

The product of its digits is 8100, while the sum is 30.

The square root of 13315665 is about 3649.0635785089. The cubic root of 13315665 is about 237.0214333729.

Adding to 13315665 its reverse (56651331), we get a palindrome (69966996).

It can be divided in two parts, 1331 and 5665, that added together give a palindrome (6996).

The spelling of 13315665 in words is "thirteen million, three hundred fifteen thousand, six hundred sixty-five".