12661018 has 4 divisors (see below), whose sum is σ = 18991530. Its totient is φ = 6330508.

The previous prime is 12660997. The next prime is 12661021. The reversal of 12661018 is 81016621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81016621 = 7 ⋅11573803.

It can be written as a sum of positive squares in only one way, i.e., 12482089 + 178929 = 3533^2 + 423^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12660983 and 12661001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3165253 + ... + 3165256.

Almost surely, 2^12661018 is an apocalyptic number.

12661018 is a deficient number, since it is larger than the sum of its proper divisors (6330512).

12661018 is an equidigital number, since it uses as much as digits as its factorization.

12661018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6330511.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12661018 is about 3558.2324263600. The cubic root of 12661018 is about 233.0716990320.

Adding to 12661018 its reverse (81016621), we get a palindrome (93677639).

The spelling of 12661018 in words is "twelve million, six hundred sixty-one thousand, eighteen".