18343330961 has 2 divisors, whose sum is σ = 18343330962. Its totient is φ = 18343330960.

The previous prime is 18343330933. The next prime is 18343330991. The reversal of 18343330961 is 16903334381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18339930625 + 3400336 = 135425^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 18343330961 - 2¹⁰ = 18343329937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18343330991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9171665480 + 9171665481.

It is an arithmetic number, because the mean of its divisors is an integer number (9171665481).

Almost surely, 2^18343330961 is an apocalyptic number.

It is an amenable number.

18343330961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18343330961 is an equidigital number, since it uses as much as digits as its factorization.

18343330961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 18343330961 in words is "eighteen billion, three hundred forty-three million, three hundred thirty thousand, nine hundred sixty-one".