18687337211173 has 16 divisors (see below), whose sum is σ = 20078958046896. Its totient is φ = 17328713564160.

The previous prime is 18687337211161. The next prime is 18687337211233. The reversal of 18687337211173 is 37111273378681.

It can be written as a sum of positive squares in 8 ways, for example, as 47377181569 + 18639960029604 = 217663^2 + 4317402^2 .

It is a cyclic number.

It is not a de Polignac number, because 18687337211173 - 2¹³ = 18687337202981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18687337211143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6833436 + ... + 9168997.

It is an arithmetic number, because the mean of its divisors is an integer number (1254934877931).

Almost surely, 2^{18687337211173} is an apocalyptic number.

It is an amenable number.

18687337211173 is a deficient number, since it is larger than the sum of its proper divisors (1391620835723).

18687337211173 is a wasteful number, since it uses less digits than its factorization.

18687337211173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16003464.

The product of its digits is 7112448, while the sum is 58.

The spelling of 18687337211173 in words is "eighteen trillion, six hundred eighty-seven billion, three hundred thirty-seven million, two hundred eleven thousand, one hundred seventy-three".