13603665121 has 8 divisors (see below), whose sum is σ = 13912060680. Its totient is φ = 13298568192.

The previous prime is 13603665109. The next prime is 13603665133. The reversal of 13603665121 is 12156630631.

It is an interprime number because it is at equal distance from previous prime (13603665109) and next prime (13603665133).

It can be written as a sum of positive squares in 4 ways, for example, as 622253025 + 12981412096 = 24945^2 + 113936^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 13603665121 - 2⁹ = 13603664609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13603665181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816316 + ... + 832813.

It is an arithmetic number, because the mean of its divisors is an integer number (1739007585).

Almost surely, 2^13603665121 is an apocalyptic number.

It is an amenable number.

13603665121 is a deficient number, since it is larger than the sum of its proper divisors (308395559).

13603665121 is a wasteful number, since it uses less digits than its factorization.

13603665121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649315.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 13603665121 in words is "thirteen billion, six hundred three million, six hundred sixty-five thousand, one hundred twenty-one".