1001000000000 has 800 divisors, whose sum is σ = 3356718406272. Its totient is φ = 288000000000.

The previous prime is 1000999999943. The next prime is 1001000000017. The reversal of 1001000000000 is 1001.

It is a sliding number, since 1001000000000 = 1000000000 + 1000000000000 and 1/1000000000 + 1/1000000000000 = 0.000000001001000000000.

It is a tau number, because it is divible by the number of its divisors (800).

It is a Harshad number since it is a multiple of its sum of digits (2).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 76999999994 + ... + 77000000006.

Almost surely, 2^{1001000000000} is an apocalyptic number.

1001000000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001000000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1678359203136).

1001000000000 is an abundant number, since it is smaller than the sum of its proper divisors (2355718406272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001000000000 is an frugal number, since it uses more digits than its factorization.

1001000000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 2.

Adding to 1001000000000 its reverse (1001), we get a palindrome (1001000001001).

1001000000000 divided by its reverse (1001) gives a 9-th power (1000000000 = 10⁹).

The spelling of 1001000000000 in words is "one trillion, one billion", and thus it is an aban number and an uban number.