2065659921 has 64 divisors (see below), whose sum is σ = 3420928000. Its totient is φ = 1223320320.

The previous prime is 2065659889. The next prime is 2065659941. The reversal of 2065659921 is 1299565602.

It is a happy number.

2065659921 is a `hidden beast` number, since 2 + 0 + 6 + 56 + 599 + 2 + 1 = 666.

It is not a de Polignac number, because 2065659921 - 2⁵ = 2065659889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2065659941) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 2491335 + ... + 2492163.

It is an arithmetic number, because the mean of its divisors is an integer number (53452000).

Almost surely, 2^2065659921 is an apocalyptic number.

It is an amenable number.

2065659921 is a deficient number, since it is larger than the sum of its proper divisors (1355268079).

2065659921 is a wasteful number, since it uses less digits than its factorization.

2065659921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 2065659921 is about 45449.5315817446. The cubic root of 2065659921 is about 1273.5605790265.

The spelling of 2065659921 in words is "two billion, sixty-five million, six hundred fifty-nine thousand, nine hundred twenty-one".