18618773273 has 2 divisors, whose sum is σ = 18618773274. Its totient is φ = 18618773272.

The previous prime is 18618773237. The next prime is 18618773279. The reversal of 18618773273 is 37237781681.

Together with previous prime (18618773237) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17533202569 + 1085570704 = 132413^2 + 32948^2 .

It is a cyclic number.

It is not a de Polignac number, because 18618773273 - 2⁶ = 18618773209 is a prime.

It is not a weakly prime, because it can be changed into another prime (18618773279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9309386636 + 9309386637.

It is an arithmetic number, because the mean of its divisors is an integer number (9309386637).

Almost surely, 2^18618773273 is an apocalyptic number.

It is an amenable number.

18618773273 is a deficient number, since it is larger than the sum of its proper divisors (1).

18618773273 is an equidigital number, since it uses as much as digits as its factorization.

18618773273 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 18618773273 in words is "eighteen billion, six hundred eighteen million, seven hundred seventy-three thousand, two hundred seventy-three".