999918240173 has 2 divisors, whose sum is σ = 999918240174. Its totient is φ = 999918240172.

The previous prime is 999918240091. The next prime is 999918240199. The reversal of 999918240173 is 371042819999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 950989684969 + 48928555204 = 975187^2 + 221198^2 .

It is an emirp because it is prime and its reverse (371042819999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999918240173 - 2¹⁶ = 999918174637 is a prime.

It is a super-2 number, since 2×999918240173² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999918240073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499959120086 + 499959120087.

It is an arithmetic number, because the mean of its divisors is an integer number (499959120087).

Almost surely, 2^999918240173 is an apocalyptic number.

It is an amenable number.

999918240173 is a deficient number, since it is larger than the sum of its proper divisors (1).

999918240173 is an equidigital number, since it uses as much as digits as its factorization.

999918240173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The spelling of 999918240173 in words is "nine hundred ninety-nine billion, nine hundred eighteen million, two hundred forty thousand, one hundred seventy-three".