65669661 has 6 divisors (see below), whose sum is σ = 94856190. Its totient is φ = 43779768.

The previous prime is 65669651. The next prime is 65669663. The reversal of 65669661 is 16696656.

65669661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 36832761 + 28836900 = 6069^2 + 5370^2 .

It is not a de Polignac number, because 65669661 - 2¹⁷ = 65538589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65669663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3648306 + ... + 3648323.

It is an arithmetic number, because the mean of its divisors is an integer number (15809365).

Almost surely, 2^65669661 is an apocalyptic number.

It is an amenable number.

65669661 is a deficient number, since it is larger than the sum of its proper divisors (29186529).

65669661 is a wasteful number, since it uses less digits than its factorization.

65669661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296635 (or 7296632 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 65669661 is about 8103.6819409451. The cubic root of 65669661 is about 403.4486421369.

The spelling of 65669661 in words is "sixty-five million, six hundred sixty-nine thousand, six hundred sixty-one".