18687506022173 has 16 divisors (see below), whose sum is σ = 19211675333760. Its totient is φ = 18164350708416.

The previous prime is 18687506022161. The next prime is 18687506022191. The reversal of 18687506022173 is 37122060578681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18687506022173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18687506022473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161237318 + ... + 161353176.

It is an arithmetic number, because the mean of its divisors is an integer number (1200729708360).

Almost surely, 2^{18687506022173} is an apocalyptic number.

It is an amenable number.

18687506022173 is a deficient number, since it is larger than the sum of its proper divisors (524169311587).

18687506022173 is a wasteful number, since it uses less digits than its factorization.

18687506022173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120196.

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 18687506022173 in words is "eighteen trillion, six hundred eighty-seven billion, five hundred six million, twenty-two thousand, one hundred seventy-three".