999955444559998 has 4 divisors (see below), whose sum is σ = 1499933166840000. Its totient is φ = 499977722279998.

The previous prime is 999955444559963. The next prime is 999955444559999. The reversal of 999955444559998 is 899955444559999.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×999955444559998² (a number of 31 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (103) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 999955444559897 and 999955444559906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999955444559999) 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 as a sum of consecutive naturals, namely, 249988861139998 + ... + 249988861140001.

It is an arithmetic number, because the mean of its divisors is an integer number (374983291710000).

Almost surely, 2^{999955444559998} is an apocalyptic number.

999955444559998 is a deficient number, since it is larger than the sum of its proper divisors (499977722280002).

999955444559998 is a wasteful number, since it uses less digits than its factorization.

999955444559998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499977722280001.

The product of its digits is 1530550080000, while the sum is 103.

Subtracting from 999955444559998 its reverse (899955444559999), we obtain a palindrome (99999999999999).

The spelling of 999955444559998 in words is "nine hundred ninety-nine trillion, nine hundred fifty-five billion, four hundred forty-four million, five hundred fifty-nine thousand, nine hundred ninety-eight".