2181687287887 has 8 divisors (see below), whose sum is σ = 2196389358000. Its totient is φ = 2166986016384.

The previous prime is 2181687287839. The next prime is 2181687287893. The reversal of 2181687287887 is 7887827861812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2181687287887 - 2¹¹ = 2181687285839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181607287887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5910039 + ... + 6268327.

It is an arithmetic number, because the mean of its divisors is an integer number (274548669750).

Almost surely, 2^{2181687287887} is an apocalyptic number.

2181687287887 is a deficient number, since it is larger than the sum of its proper divisors (14702070113).

2181687287887 is a wasteful number, since it uses less digits than its factorization.

2181687287887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399305.

The product of its digits is 269746176, while the sum is 73.

The spelling of 2181687287887 in words is "two trillion, one hundred eighty-one billion, six hundred eighty-seven million, two hundred eighty-seven thousand, eight hundred eighty-seven".