2116661971894 has 8 divisors (see below), whose sum is σ = 3218486012280. Its totient is φ = 1043833301136.

The previous prime is 2116661971889. The next prime is 2116661971909. The reversal of 2116661971894 is 4981791666112.

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

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 3 ways as a sum of consecutive naturals, for example, 7248842224 + ... + 7248842515.

It is an arithmetic number, because the mean of its divisors is an integer number (402310751535).

Almost surely, 2^{2116661971894} is an apocalyptic number.

2116661971894 is a deficient number, since it is larger than the sum of its proper divisors (1101824040386).

2116661971894 is a wasteful number, since it uses less digits than its factorization.

2116661971894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14497684814.

The product of its digits is 7838208, while the sum is 61.

The spelling of 2116661971894 in words is "two trillion, one hundred sixteen billion, six hundred sixty-one million, nine hundred seventy-one thousand, eight hundred ninety-four".