13665555110661 has 4 divisors (see below), whose sum is σ = 18220740147552. Its totient is φ = 9110370073772.

The previous prime is 13665555110639. The next prime is 13665555110687. The reversal of 13665555110661 is 16601155556631.

13665555110661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13665555110661 - 2⁷ = 13665555110533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665555112661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277592518441 + ... + 2277592518446.

It is an arithmetic number, because the mean of its divisors is an integer number (4555185036888).

Almost surely, 2^{13665555110661} is an apocalyptic number.

It is an amenable number.

13665555110661 is a deficient number, since it is larger than the sum of its proper divisors (4555185036891).

13665555110661 is an equidigital number, since it uses as much as digits as its factorization.

13665555110661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555185036890.

The product of its (nonzero) digits is 2430000, while the sum is 51.

The spelling of 13665555110661 in words is "thirteen trillion, six hundred sixty-five billion, five hundred fifty-five million, one hundred ten thousand, six hundred sixty-one".