2000000000081 has 4 divisors (see below), whose sum is σ = 2105263158000. Its totient is φ = 1894736842164.

The previous prime is 2000000000003. The next prime is 2000000000123. The reversal of 2000000000081 is 1800000000002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2000000000081 - 2³⁴ = 1982820130897 is a prime.

It is a super-2 number, since 2×2000000000081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1999999999981 and 2000000000071.

It is not an unprimeable number, because it can be changed into a prime (2000000000381) 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, 52631578931 + ... + 52631578968.

It is an arithmetic number, because the mean of its divisors is an integer number (526315789500).

Almost surely, 2^{2000000000081} is an apocalyptic number.

It is an amenable number.

2000000000081 is a deficient number, since it is larger than the sum of its proper divisors (105263157919).

2000000000081 is a wasteful number, since it uses less digits than its factorization.

2000000000081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105263157918.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2000000000081 its reverse (1800000000002), we get a palindrome (3800000000083).

The spelling of 2000000000081 in words is "two trillion, eighty-one", and thus it is an aban number and an uban number.