18734491873 has 2 divisors, whose sum is σ = 18734491874. Its totient is φ = 18734491872.

The previous prime is 18734491849. The next prime is 18734491877. The reversal of 18734491873 is 37819443781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10267363584 + 8467128289 = 101328^2 + 92017^2 .

It is a cyclic number.

It is not a de Polignac number, because 18734491873 - 2³³ = 10144557281 is a prime.

It is not a weakly prime, because it can be changed into another prime (18734491877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367245936 + 9367245937.

It is an arithmetic number, because the mean of its divisors is an integer number (9367245937).

Almost surely, 2^18734491873 is an apocalyptic number.

It is an amenable number.

18734491873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18734491873 is an equidigital number, since it uses as much as digits as its factorization.

18734491873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 55.

The spelling of 18734491873 in words is "eighteen billion, seven hundred thirty-four million, four hundred ninety-one thousand, eight hundred seventy-three".