13661332056 has 48 divisors (see below), whose sum is σ = 39175882200. Its totient is φ = 4285907712.

The previous prime is 13661332019. The next prime is 13661332121. The reversal of 13661332056 is 65023316631.

13661332056 is a `hidden beast` number, since 1 + 3 + 6 + 613 + 32 + 0 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 13661332056.

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, 5579386 + ... + 5581833.

Almost surely, 2^13661332056 is an apocalyptic number.

It is an amenable number.

13661332056 is an abundant number, since it is smaller than the sum of its proper divisors (25514550144).

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

13661332056 is a wasteful number, since it uses less digits than its factorization.

13661332056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11161248 (or 11161241 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

Adding to 13661332056 its reverse (65023316631), we get a palindrome (78684648687).

The spelling of 13661332056 in words is "thirteen billion, six hundred sixty-one million, three hundred thirty-two thousand, fifty-six".