18505369747 has 2 divisors, whose sum is σ = 18505369748. Its totient is φ = 18505369746.

The previous prime is 18505369733. The next prime is 18505369787. The reversal of 18505369747 is 74796350581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18505369747 - 2¹⁹ = 18504845459 is a prime.

It is not a weakly prime, because it can be changed into another prime (18505369787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9252684873 + 9252684874.

It is an arithmetic number, because the mean of its divisors is an integer number (9252684874).

Almost surely, 2^18505369747 is an apocalyptic number.

18505369747 is a deficient number, since it is larger than the sum of its proper divisors (1).

18505369747 is an equidigital number, since it uses as much as digits as its factorization.

18505369747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 18505369747 in words is "eighteen billion, five hundred five million, three hundred sixty-nine thousand, seven hundred forty-seven".