65566559 has 2 divisors, whose sum is σ = 65566560. Its totient is φ = 65566558.

The previous prime is 65566547. The next prime is 65566561. The reversal of 65566559 is 95566556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65566559 - 2¹² = 65562463 is a prime.

Together with 65566561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64566559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32783279 + 32783280.

It is an arithmetic number, because the mean of its divisors is an integer number (32783280).

Almost surely, 2^65566559 is an apocalyptic number.

65566559 is a deficient number, since it is larger than the sum of its proper divisors (1).

65566559 is an equidigital number, since it uses as much as digits as its factorization.

65566559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1215000, while the sum is 47.

The square root of 65566559 is about 8097.3180127744. The cubic root of 65566559 is about 403.2373921261.

The spelling of 65566559 in words is "sixty-five million, five hundred sixty-six thousand, five hundred fifty-nine".