65685989 has 6 divisors (see below), whose sum is σ = 67510674. Its totient is φ = 63909360.

The previous prime is 65685967. The next prime is 65686003. The reversal of 65685989 is 98958656.

It can be written as a sum of positive squares in 3 ways, for example, as 28536964 + 37149025 = 5342^2 + 6095^2 .

It is not a de Polignac number, because 65685989 - 2⁸ = 65685733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65685089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22622 + ... + 25359.

It is an arithmetic number, because the mean of its divisors is an integer number (11251779).

Almost surely, 2^65685989 is an apocalyptic number.

It is an amenable number.

65685989 is a deficient number, since it is larger than the sum of its proper divisors (1824685).

65685989 is an equidigital number, since it uses as much as digits as its factorization.

65685989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48055 (or 48018 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 56.

The square root of 65685989 is about 8104.6893216212. The cubic root of 65685989 is about 403.4820769755.

The spelling of 65685989 in words is "sixty-five million, six hundred eighty-five thousand, nine hundred eighty-nine".