18163951273 has 8 divisors (see below), whose sum is σ = 19881854216. Its totient is φ = 16491859200.

The previous prime is 18163951271. The next prime is 18163951301. The reversal of 18163951273 is 37215936181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1399657744 + 16764293529 = 37412^2 + 129477^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18163951273 - 2¹ = 18163951271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18163951271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11451888 + ... + 11453473.

It is an arithmetic number, because the mean of its divisors is an integer number (2485231777).

Almost surely, 2^18163951273 is an apocalyptic number.

18163951273 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18163951273 is a deficient number, since it is larger than the sum of its proper divisors (1717902943).

18163951273 is a wasteful number, since it uses less digits than its factorization.

18163951273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22905435.

The product of its digits is 272160, while the sum is 46.

The spelling of 18163951273 in words is "eighteen billion, one hundred sixty-three million, nine hundred fifty-one thousand, two hundred seventy-three".