65669161 has 4 divisors (see below), whose sum is σ = 65776212. Its totient is φ = 65562112.

The previous prime is 65669143. The next prime is 65669189. The reversal of 65669161 is 16196656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20025625 + 45643536 = 4475^2 + 6756^2 .

It is a cyclic number.

It is not a de Polignac number, because 65669161 - 2⁹ = 65668649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65669101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52600 + ... + 53833.

It is an arithmetic number, because the mean of its divisors is an integer number (16444053).

Almost surely, 2^65669161 is an apocalyptic number.

It is an amenable number.

65669161 is a deficient number, since it is larger than the sum of its proper divisors (107051).

65669161 is a wasteful number, since it uses less digits than its factorization.

65669161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107050.

The product of its digits is 58320, while the sum is 40.

The square root of 65669161 is about 8103.6510907121. The cubic root of 65669161 is about 403.4476181997.

The spelling of 65669161 in words is "sixty-five million, six hundred sixty-nine thousand, one hundred sixty-one".