2081664447 has 8 divisors (see below), whose sum is σ = 2795812656. Its totient is φ = 1377646272.

The previous prime is 2081664397. The next prime is 2081664461. The reversal of 2081664447 is 7444661802.

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

It is not a de Polignac number, because 2081664447 - 2¹¹ = 2081662399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2081664399 and 2081664408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081664047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2532028 + ... + 2532849.

It is an arithmetic number, because the mean of its divisors is an integer number (349476582).

Almost surely, 2^2081664447 is an apocalyptic number.

2081664447 is a deficient number, since it is larger than the sum of its proper divisors (714148209).

2081664447 is a wasteful number, since it uses less digits than its factorization.

2081664447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5065017.

The product of its (nonzero) digits is 258048, while the sum is 42.

The square root of 2081664447 is about 45625.2610622668. The cubic root of 2081664447 is about 1276.8412606611.

The spelling of 2081664447 in words is "two billion, eighty-one million, six hundred sixty-four thousand, four hundred forty-seven".