18618773237 has 2 divisors, whose sum is σ = 18618773238. Its totient is φ = 18618773236.

The previous prime is 18618773209. The next prime is 18618773273. The reversal of 18618773237 is 73237781681.

Together with next prime (18618773273) 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., 13695084676 + 4923688561 = 117026^2 + 70169^2 .

It is an emirp because it is prime and its reverse (73237781681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18618773237 - 2³⁴ = 1438904053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18618773207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9309386618 + 9309386619.

It is an arithmetic number, because the mean of its divisors is an integer number (9309386619).

Almost surely, 2^18618773237 is an apocalyptic number.

It is an amenable number.

18618773237 is a deficient number, since it is larger than the sum of its proper divisors (1).

18618773237 is an equidigital number, since it uses as much as digits as its factorization.

18618773237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 53.

The spelling of 18618773237 in words is "eighteen billion, six hundred eighteen million, seven hundred seventy-three thousand, two hundred thirty-seven".