899999999999999 has 4 divisors (see below), whose sum is σ = 900000060000000. Its totient is φ = 899999940000000.

The previous prime is 899999999999983. The next prime is 900000000000019. The reversal of 899999999999999 is 999999999999998.

It is a Cunningham number, because it is equal to 30000000²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 899999999999999 - 2⁴ = 899999999999983 is a prime.

It is a super-9 number, since 9×899999999999999⁹ (a number of 136 digits) contains 999999999 as substring.

It is a Duffinian number.

899999999999999 is a modest number, since divided by 99999999 gives 8999999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899999999999099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14999999 + ... + 44999999.

It is an arithmetic number, because the mean of its divisors is an integer number (225000015000000).

Almost surely, 2^{899999999999999} is an apocalyptic number.

899999999999999 is a deficient number, since it is larger than the sum of its proper divisors (60000001).

899999999999999 is a wasteful number, since it uses less digits than its factorization.

899999999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60000000.

The product of its digits is 183014339639688, while the sum is 134.

Subtracting 899999999999999 from its reverse (999999999999998), we obtain a palindrome (99999999999999).

The spelling of 899999999999999 in words is "eight hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".