18993134273 has 2 divisors, whose sum is σ = 18993134274. Its totient is φ = 18993134272.

The previous prime is 18993134239. The next prime is 18993134299. The reversal of 18993134273 is 37243139981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15914327104 + 3078807169 = 126152^2 + 55487^2 .

It is a cyclic number.

It is not a de Polignac number, because 18993134273 - 2³⁴ = 1813265089 is a prime.

It is not a weakly prime, because it can be changed into another prime (18993134773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9496567136 + 9496567137.

It is an arithmetic number, because the mean of its divisors is an integer number (9496567137).

Almost surely, 2^18993134273 is an apocalyptic number.

It is an amenable number.

18993134273 is a deficient number, since it is larger than the sum of its proper divisors (1).

18993134273 is an equidigital number, since it uses as much as digits as its factorization.

18993134273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The spelling of 18993134273 in words is "eighteen billion, nine hundred ninety-three million, one hundred thirty-four thousand, two hundred seventy-three".