18603043978427 has 2 divisors, whose sum is σ = 18603043978428. Its totient is φ = 18603043978426.

The previous prime is 18603043978399. The next prime is 18603043978457. The reversal of 18603043978427 is 72487934030681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18603043978427 - 2¹⁰ = 18603043977403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18603043978427.

It is not a weakly prime, because it can be changed into another prime (18603043978457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9301521989213 + 9301521989214.

It is an arithmetic number, because the mean of its divisors is an integer number (9301521989214).

Almost surely, 2^{18603043978427} is an apocalyptic number.

18603043978427 is a deficient number, since it is larger than the sum of its proper divisors (1).

18603043978427 is an equidigital number, since it uses as much as digits as its factorization.

18603043978427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48771072, while the sum is 62.

The spelling of 18603043978427 in words is "eighteen trillion, six hundred three billion, forty-three million, nine hundred seventy-eight thousand, four hundred twenty-seven".