65499609 has 16 divisors (see below), whose sum is σ = 99952640. Its totient is φ = 37374480.

The previous prime is 65499587. The next prime is 65499619. The reversal of 65499609 is 90699456.

It is a happy number.

It is not a de Polignac number, because 65499609 - 2⁷ = 65499481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65499619) 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 in 15 ways as a sum of consecutive naturals, for example, 16224 + ... + 19854.

It is an arithmetic number, because the mean of its divisors is an integer number (6247040).

Almost surely, 2^65499609 is an apocalyptic number.

It is an amenable number.

65499609 is a deficient number, since it is larger than the sum of its proper divisors (34453031).

65499609 is a wasteful number, since it uses less digits than its factorization.

65499609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500.

The product of its (nonzero) digits is 524880, while the sum is 48.

The square root of 65499609 is about 8093.1828720226. The cubic root of 65499609 is about 403.1000968451.

The spelling of 65499609 in words is "sixty-five million, four hundred ninety-nine thousand, six hundred nine".