13601220665 has 8 divisors (see below), whose sum is σ = 16629417288. Its totient is φ = 10675674880.

The previous prime is 13601220653. The next prime is 13601220697. The reversal of 13601220665 is 56602210631.

It can be written as a sum of positive squares in 4 ways, for example, as 2077627561 + 11523593104 = 45581^2 + 107348^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13601220665 - 2⁶ = 13601220601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25662416 + ... + 25662945.

It is an arithmetic number, because the mean of its divisors is an integer number (2078677161).

Almost surely, 2^13601220665 is an apocalyptic number.

It is an amenable number.

13601220665 is a deficient number, since it is larger than the sum of its proper divisors (3028196623).

13601220665 is an equidigital number, since it uses as much as digits as its factorization.

13601220665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51325419.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 13601220665 in words is "thirteen billion, six hundred one million, two hundred twenty thousand, six hundred sixty-five".