2001689999 has 8 divisors (see below), whose sum is σ = 2007708528. Its totient is φ = 1995681600.

The previous prime is 2001689993. The next prime is 2001690017. The reversal of 2001689999 is 9999861002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001689999 - 2²⁸ = 1733254543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001689999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001689993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 567389 + ... + 570905.

It is an arithmetic number, because the mean of its divisors is an integer number (250963566).

Almost surely, 2^2001689999 is an apocalyptic number.

2001689999 is a deficient number, since it is larger than the sum of its proper divisors (6018529).

2001689999 is an equidigital number, since it uses as much as digits as its factorization.

2001689999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5065.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 2001689999 is about 44740.2503233945. The cubic root of 2001689999 is about 1260.2758275371.

The spelling of 2001689999 in words is "two billion, one million, six hundred eighty-nine thousand, nine hundred ninety-nine".