65525609 has 2 divisors, whose sum is σ = 65525610. Its totient is φ = 65525608.

The previous prime is 65525533. The next prime is 65525639. The reversal of 65525609 is 90652556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49042009 + 16483600 = 7003^2 + 4060^2 .

It is a cyclic number.

It is not a de Polignac number, because 65525609 - 2⁸ = 65525353 is a prime.

It is a super-3 number, since 3×65525609³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65525639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32762804 + 32762805.

It is an arithmetic number, because the mean of its divisors is an integer number (32762805).

Almost surely, 2^65525609 is an apocalyptic number.

It is an amenable number.

65525609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65525609 is an equidigital number, since it uses as much as digits as its factorization.

65525609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 65525609 is about 8094.7890028092. The cubic root of 65525609 is about 403.1534265074.

The spelling of 65525609 in words is "sixty-five million, five hundred twenty-five thousand, six hundred nine".