99999999991705 has 32 divisors (see below), whose sum is σ = 132706856176128. Its totient is φ = 71728581657600.

The previous prime is 99999999991687. The next prime is 99999999991711. The reversal of 99999999991705 is 50719999999999.

It is not a de Polignac number, because 99999999991705 - 2¹⁷ = 99999999860633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99999999991595 and 99999999991604.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122738037 + ... + 123550093.

It is an arithmetic number, because the mean of its divisors is an integer number (4147089255504).

Almost surely, 2^{99999999991705} is an apocalyptic number.

It is an amenable number.

99999999991705 is a deficient number, since it is larger than the sum of its proper divisors (32706856184423).

99999999991705 is a wasteful number, since it uses less digits than its factorization.

99999999991705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842817.

The product of its (nonzero) digits is 122037454035, while the sum is 103.

The spelling of 99999999991705 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-one thousand, seven hundred five".