13661053218 has 42 divisors (see below), whose sum is σ = 30733355457. Its totient is φ = 4552196760.

The previous prime is 13661053199. The next prime is 13661053223. The reversal of 13661053218 is 81235016631.

13661053218 is a `hidden beast` number, since 1 + 3 + 6 + 610 + 5 + 32 + 1 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9706781529 + 3954271689 = 98523^2 + 62883^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=82647.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 4461408 + ... + 4464468.

Almost surely, 2^13661053218 is an apocalyptic number.

13661053218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13661053218

13661053218 is an abundant number, since it is smaller than the sum of its proper divisors (17072302239).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13661053218 is an frugal number, since it uses more digits than its factorization.

13661053218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6142 (or 3066 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 13661053218 its reverse (81235016631), we get a palindrome (94896069849).

The spelling of 13661053218 in words is "thirteen billion, six hundred sixty-one million, fifty-three thousand, two hundred eighteen".