2271665816 has 64 divisors (see below), whose sum is σ = 5044377600. Its totient is φ = 938383488.

The previous prime is 2271665789. The next prime is 2271665831. The reversal of 2271665816 is 6185661722.

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 in 15 ways as a sum of consecutive naturals, for example, 1595681 + ... + 1597103.

It is an arithmetic number, because the mean of its divisors is an integer number (78818400).

Almost surely, 2^2271665816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2271665816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2522188800).

2271665816 is an abundant number, since it is smaller than the sum of its proper divisors (2772711784).

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

2271665816 is a wasteful number, since it uses less digits than its factorization.

2271665816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448 (or 2444 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 2271665816 is about 47661.9955100497. The cubic root of 2271665816 is about 1314.5632317964.

The spelling of 2271665816 in words is "two billion, two hundred seventy-one million, six hundred sixty-five thousand, eight hundred sixteen".