13661018 has 16 divisors (see below), whose sum is σ = 24175104. Its totient is φ = 5665680.

The previous prime is 13661017. The next prime is 13661033. The reversal of 13661018 is 81016631.

13661018 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

13661018 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (13661017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15305 + ... + 16172.

It is an arithmetic number, because the mean of its divisors is an integer number (1510944).

Almost surely, 2^13661018 is an apocalyptic number.

13661018 is a deficient number, since it is larger than the sum of its proper divisors (10514086).

13661018 is a wasteful number, since it uses less digits than its factorization.

13661018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31517.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 13661018 is about 3696.0814384967. The cubic root of 13661018 is about 239.0530860177.

Adding to 13661018 its reverse (81016631), we get a palindrome (94677649).

The spelling of 13661018 in words is "thirteen million, six hundred sixty-one thousand, eighteen".