18811598473 has 2 divisors, whose sum is σ = 18811598474. Its totient is φ = 18811598472.

The previous prime is 18811598471. The next prime is 18811598567. The reversal of 18811598473 is 37489511881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18810671104 + 927369 = 137152^2 + 963^2 .

It is a cyclic number.

It is not a de Polignac number, because 18811598473 - 2¹ = 18811598471 is a prime.

Together with 18811598471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18811598471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9405799236 + 9405799237.

It is an arithmetic number, because the mean of its divisors is an integer number (9405799237).

Almost surely, 2^18811598473 is an apocalyptic number.

It is an amenable number.

18811598473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18811598473 is an equidigital number, since it uses as much as digits as its factorization.

18811598473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 55.

The spelling of 18811598473 in words is "eighteen billion, eight hundred eleven million, five hundred ninety-eight thousand, four hundred seventy-three".