13203430203661 has 4 divisors (see below), whose sum is σ = 13211697850972. Its totient is φ = 13195162556352.

The previous prime is 13203430203659. The next prime is 13203430203703. The reversal of 13203430203661 is 16630203430231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3835698748036 + 9367731455625 = 1958494^2 + 3060675^2 .

It is a cyclic number.

It is not a de Polignac number, because 13203430203661 - 2¹ = 13203430203659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13203430204661) 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, 4133821260 + ... + 4133824453.

It is an arithmetic number, because the mean of its divisors is an integer number (3302924462743).

Almost surely, 2^{13203430203661} is an apocalyptic number.

It is an amenable number.

13203430203661 is a deficient number, since it is larger than the sum of its proper divisors (8267647311).

13203430203661 is an equidigital number, since it uses as much as digits as its factorization.

13203430203661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8267647310.

The product of its (nonzero) digits is 46656, while the sum is 34.

Adding to 13203430203661 its reverse (16630203430231), we get a palindrome (29833633633892).

The spelling of 13203430203661 in words is "thirteen trillion, two hundred three billion, four hundred thirty million, two hundred three thousand, six hundred sixty-one".