2162001520681 has 4 divisors (see below), whose sum is σ = 2162344647364. Its totient is φ = 2161658394000.

The previous prime is 2162001520673. The next prime is 2162001520727. The reversal of 2162001520681 is 1860251002612.

It is a happy number.

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 835001198656 + 1327000322025 = 913784^2 + 1151955^2 .

It is a cyclic number.

It is not a de Polignac number, because 2162001520681 - 2³ = 2162001520673 is a prime.

It is a super-2 number, since 2×2162001520681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2162001520181) 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, 171553890 + ... + 171566491.

It is an arithmetic number, because the mean of its divisors is an integer number (540586161841).

Almost surely, 2^{2162001520681} is an apocalyptic number.

It is an amenable number.

2162001520681 is a deficient number, since it is larger than the sum of its proper divisors (343126683).

2162001520681 is an equidigital number, since it uses as much as digits as its factorization.

2162001520681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343126682.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 2162001520681 in words is "two trillion, one hundred sixty-two billion, one million, five hundred twenty thousand, six hundred eighty-one".