65289661 has 2 divisors, whose sum is σ = 65289662. Its totient is φ = 65289660.

The previous prime is 65289649. The next prime is 65289677. The reversal of 65289661 is 16698256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35105625 + 30184036 = 5925^2 + 5494^2 .

It is a cyclic number.

It is not a de Polignac number, because 65289661 - 2¹⁷ = 65158589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65289641) 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 as a sum of consecutive naturals, namely, 32644830 + 32644831.

It is an arithmetic number, because the mean of its divisors is an integer number (32644831).

Almost surely, 2^65289661 is an apocalyptic number.

It is an amenable number.

65289661 is a deficient number, since it is larger than the sum of its proper divisors (1).

65289661 is an equidigital number, since it uses as much as digits as its factorization.

65289661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 65289661 is about 8080.2017920347. The cubic root of 65289661 is about 402.6689459611.

The spelling of 65289661 in words is "sixty-five million, two hundred eighty-nine thousand, six hundred sixty-one".