99916861999 has 4 divisors (see below), whose sum is σ = 99919393120. Its totient is φ = 99914330880.

The previous prime is 99916861997. The next prime is 99916862051.

99916861999 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 99916861999 - 2¹ = 99916861997 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 (99916861991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205394 + ... + 1285615.

It is an arithmetic number, because the mean of its divisors is an integer number (24979848280).

Almost surely, 2^99916861999 is an apocalyptic number.

99916861999 is a deficient number, since it is larger than the sum of its proper divisors (2531121).

99916861999 is a wasteful number, since it uses less digits than its factorization.

99916861999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531120.

The product of its digits is 153055008, while the sum is 76.

The spelling of 99916861999 in words is "ninety-nine billion, nine hundred sixteen million, eight hundred sixty-one thousand, nine hundred ninety-nine".