1002000019985 has 4 divisors (see below), whose sum is σ = 1202400023988. Its totient is φ = 801600015984.

The previous prime is 1002000019981. The next prime is 1002000019991. The reversal of 1002000019985 is 5899100002001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 142817479744 + 859182540241 = 377912^2 + 926921^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002000019985 - 2² = 1002000019981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1002000019981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100200001994 + ... + 100200002003.

It is an arithmetic number, because the mean of its divisors is an integer number (300600005997).

Almost surely, 2^{1002000019985} is an apocalyptic number.

It is an amenable number.

1002000019985 is a deficient number, since it is larger than the sum of its proper divisors (200400004003).

1002000019985 is an equidigital number, since it uses as much as digits as its factorization.

1002000019985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200400004002.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 1002000019985 in words is "one trillion, two billion, nineteen thousand, nine hundred eighty-five".