65590509609 has 12 divisors (see below), whose sum is σ = 94747013556. Its totient is φ = 43724621952.

The previous prime is 65590509599. The next prime is 65590509613. The reversal of 65590509609 is 90690509556.

It can be written as a sum of positive squares in 2 ways, for example, as 30716067600 + 34874442009 = 175260^2 + 186747^2 .

It is not a de Polignac number, because 65590509609 - 2²⁷ = 65456291881 is a prime.

It is a super-2 number, since 2×65590509609² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (65590505609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15612 + ... + 362525.

It is an arithmetic number, because the mean of its divisors is an integer number (7895584463).

Almost surely, 2^65590509609 is an apocalyptic number.

It is an amenable number.

65590509609 is a deficient number, since it is larger than the sum of its proper divisors (29156503947).

65590509609 is a wasteful number, since it uses less digits than its factorization.

65590509609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397416 (or 397413 counting only the distinct ones).

The product of its (nonzero) digits is 3280500, while the sum is 54.

The spelling of 65590509609 in words is "sixty-five billion, five hundred ninety million, five hundred nine thousand, six hundred nine".