999999999905 has 8 divisors (see below), whose sum is σ = 1200471898752. Its totient is φ = 799685400688.

The previous prime is 999999999899. The next prime is 999999999937. The reversal of 999999999905 is 509999999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999999905 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999999999799 and 999999999808.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39310919 + ... + 39336348.

It is an arithmetic number, because the mean of its divisors is an integer number (150058987344).

Almost surely, 2^999999999905 is an apocalyptic number.

It is an amenable number.

999999999905 is a deficient number, since it is larger than the sum of its proper divisors (200471898847).

999999999905 is a wasteful number, since it uses less digits than its factorization.

999999999905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78649815.

The product of its (nonzero) digits is 17433922005, while the sum is 95.

Adding to 999999999905 its sum of digits (95), we get a 12-th power (1000000000000 = 10¹²).

The spelling of 999999999905 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred five".