18345042361 has 2 divisors, whose sum is σ = 18345042362. Its totient is φ = 18345042360.

The previous prime is 18345042341. The next prime is 18345042377. The reversal of 18345042361 is 16324054381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16501971600 + 1843070761 = 128460^2 + 42931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18345042361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18345042361.

It is not a weakly prime, because it can be changed into another prime (18345042301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9172521180 + 9172521181.

It is an arithmetic number, because the mean of its divisors is an integer number (9172521181).

Almost surely, 2^18345042361 is an apocalyptic number.

It is an amenable number.

18345042361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18345042361 is an equidigital number, since it uses as much as digits as its factorization.

18345042361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 18345042361 in words is "eighteen billion, three hundred forty-five million, forty-two thousand, three hundred sixty-one".