2016891566 has 4 divisors (see below), whose sum is σ = 3025337352. Its totient is φ = 1008445782.

The previous prime is 2016891511. The next prime is 2016891587. The reversal of 2016891566 is 6651986102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6651986102 = 2 ⋅3325993051.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504222890 + ... + 504222893.

It is an arithmetic number, because the mean of its divisors is an integer number (756334338).

Almost surely, 2^2016891566 is an apocalyptic number.

2016891566 is a deficient number, since it is larger than the sum of its proper divisors (1008445786).

2016891566 is a wasteful number, since it uses less digits than its factorization.

2016891566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008445785.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 2016891566 is about 44909.8159203531. The cubic root of 2016891566 is about 1263.4581173323.

The spelling of 2016891566 in words is "two billion, sixteen million, eight hundred ninety-one thousand, five hundred sixty-six".