2106781787884 has 6 divisors (see below), whose sum is σ = 3686868128804. Its totient is φ = 1053390893940.

The previous prime is 2106781787879. The next prime is 2106781787941. The reversal of 2106781787884 is 4887871876012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263347723482 + ... + 263347723489.

Almost surely, 2^{2106781787884} is an apocalyptic number.

It is an amenable number.

2106781787884 is a deficient number, since it is larger than the sum of its proper divisors (1580086340920).

2106781787884 is a wasteful number, since it uses less digits than its factorization.

2106781787884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526695446975 (or 526695446973 counting only the distinct ones).

The product of its (nonzero) digits is 67436544, while the sum is 67.

The spelling of 2106781787884 in words is "two trillion, one hundred six billion, seven hundred eighty-one million, seven hundred eighty-seven thousand, eight hundred eighty-four".