99918281999 has 4 divisors (see below), whose sum is σ = 99919336440. Its totient is φ = 99917227560.

The previous prime is 99918281963. The next prime is 99918282041.

99918281999 is nontrivially palindromic in base 10.

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 99918281999 - 2²⁴ = 99901504783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99918281909) 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 in 3 ways as a sum of consecutive naturals, for example, 369317 + ... + 579854.

It is an arithmetic number, because the mean of its divisors is an integer number (24979834110).

Almost surely, 2^99918281999 is an apocalyptic number.

99918281999 is a deficient number, since it is larger than the sum of its proper divisors (1054441).

99918281999 is a wasteful number, since it uses less digits than its factorization.

99918281999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054440.

The product of its digits is 68024448, while the sum is 74.

The spelling of 99918281999 in words is "ninety-nine billion, nine hundred eighteen million, two hundred eighty-one thousand, nine hundred ninety-nine".