2163018718081 has 4 divisors (see below), whose sum is σ = 2329404773332. Its totient is φ = 1996632662832.

The previous prime is 2163018718073. The next prime is 2163018718097. The reversal of 2163018718081 is 1808178103612.

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 1074209946481 + 1088808771600 = 1036441^2 + 1043460^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163018718081 - 2³ = 2163018718073 is a prime.

It is a super-2 number, since 2×2163018718081² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2163018718031) 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, 83193027606 + ... + 83193027631.

It is an arithmetic number, because the mean of its divisors is an integer number (582351193333).

Almost surely, 2^{2163018718081} is an apocalyptic number.

It is an amenable number.

2163018718081 is a deficient number, since it is larger than the sum of its proper divisors (166386055251).

2163018718081 is a wasteful number, since it uses less digits than its factorization.

2163018718081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166386055250.

The product of its (nonzero) digits is 129024, while the sum is 46.

The spelling of 2163018718081 in words is "two trillion, one hundred sixty-three billion, eighteen million, seven hundred eighteen thousand, eighty-one".