65815085 has 24 divisors (see below), whose sum is σ = 92253816. Its totient is φ = 44943360.

The previous prime is 65815081. The next prime is 65815117. The reversal of 65815085 is 58051856.

65815085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 561001 + 65254084 = 749^2 + 8078^2 .

It is not a de Polignac number, because 65815085 - 2² = 65815081 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65815081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86105 + ... + 86865.

It is an arithmetic number, because the mean of its divisors is an integer number (3843909).

Almost surely, 2^65815085 is an apocalyptic number.

It is an amenable number.

65815085 is a deficient number, since it is larger than the sum of its proper divisors (26438731).

65815085 is a wasteful number, since it uses less digits than its factorization.

65815085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 65815085 is about 8112.6496904526. The cubic root of 65815085 is about 403.7462319170.

The spelling of 65815085 in words is "sixty-five million, eight hundred fifteen thousand, eighty-five".