2065650561 has 48 divisors (see below), whose sum is σ = 3308078592. Its totient is φ = 1233964800.

The previous prime is 2065650553. The next prime is 2065650563. The reversal of 2065650561 is 1650565602.

It is a happy number.

It is not a de Polignac number, because 2065650561 - 2³ = 2065650553 is a prime.

It is a super-2 number, since 2×2065650561² = 8533824480319229442, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2065650563) 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 47 ways as a sum of consecutive naturals, for example, 1068766 + ... + 1070696.

It is an arithmetic number, because the mean of its divisors is an integer number (68918304).

Almost surely, 2^2065650561 is an apocalyptic number.

It is an amenable number.

2065650561 is a deficient number, since it is larger than the sum of its proper divisors (1242428031).

2065650561 is a wasteful number, since it uses less digits than its factorization.

2065650561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214 (or 2211 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 2065650561 is about 45449.4286102697. The cubic root of 2065650561 is about 1273.5586554208.

It can be divided in two parts, 20656 and 50561, that added together give a palindrome (71217).

The spelling of 2065650561 in words is "two billion, sixty-five million, six hundred fifty thousand, five hundred sixty-one".