18505000537 has 2 divisors, whose sum is σ = 18505000538. Its totient is φ = 18505000536.

The previous prime is 18505000529. The next prime is 18505000573. The reversal of 18505000537 is 73500050581.

Together with next prime (18505000573) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12449203776 + 6055796761 = 111576^2 + 77819^2 .

It is an emirp because it is prime and its reverse (73500050581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18505000537 - 2³ = 18505000529 is a prime.

It is not a weakly prime, because it can be changed into another prime (18505000237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9252500268 + 9252500269.

It is an arithmetic number, because the mean of its divisors is an integer number (9252500269).

Almost surely, 2^18505000537 is an apocalyptic number.

It is an amenable number.

18505000537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18505000537 is an equidigital number, since it uses as much as digits as its factorization.

18505000537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The spelling of 18505000537 in words is "eighteen billion, five hundred five million, five hundred thirty-seven", and thus it is an aban number.