13661400343 has 2 divisors, whose sum is σ = 13661400344. Its totient is φ = 13661400342.

The previous prime is 13661400331. The next prime is 13661400391. The reversal of 13661400343 is 34300416631.

It is a happy number.

13661400343 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13661400343 - 2⁹ = 13661399831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13661400043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6830700171 + 6830700172.

It is an arithmetic number, because the mean of its divisors is an integer number (6830700172).

Almost surely, 2^13661400343 is an apocalyptic number.

13661400343 is a deficient number, since it is larger than the sum of its proper divisors (1).

13661400343 is an equidigital number, since it uses as much as digits as its factorization.

13661400343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

Adding to 13661400343 its reverse (34300416631), we get a palindrome (47961816974).

The spelling of 13661400343 in words is "thirteen billion, six hundred sixty-one million, four hundred thousand, three hundred forty-three".