999616999 has 16 divisors (see below), whose sum is σ = 1075680000. Its totient is φ = 926069760.

The previous prime is 999616991. The next prime is 999617039.

999616999 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 999616999 - 2³ = 999616991 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 (999616991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220839 + ... + 225319.

It is an arithmetic number, because the mean of its divisors is an integer number (67230000).

Almost surely, 2^999616999 is an apocalyptic number.

999616999 is a deficient number, since it is larger than the sum of its proper divisors (76063001).

999616999 is a wasteful number, since it uses less digits than its factorization.

999616999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4758.

The product of its digits is 19131876, while the sum is 67.

The square root of 999616999 is about 31616.7202441999. The cubic root of 999616999 is about 999.8723166977.

The spelling of 999616999 in words is "nine hundred ninety-nine million, six hundred sixteen thousand, nine hundred ninety-nine".