2181687287886 has 48 divisors (see below), whose sum is σ = 4890416927760. Its totient is φ = 702090748800.

The previous prime is 2181687287839. The next prime is 2181687287893. The reversal of 2181687287886 is 6887827861812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5983041 + ... + 6337203.

It is an arithmetic number, because the mean of its divisors is an integer number (101883685995).

Almost surely, 2^{2181687287886} is an apocalyptic number.

2181687287886 is an abundant number, since it is smaller than the sum of its proper divisors (2708729639874).

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

2181687287886 is a wasteful number, since it uses less digits than its factorization.

2181687287886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366001 (or 365998 counting only the distinct ones).

The product of its digits is 231211008, while the sum is 72.

The spelling of 2181687287886 in words is "two trillion, one hundred eighty-one billion, six hundred eighty-seven million, two hundred eighty-seven thousand, eight hundred eighty-six".