65328561 has 12 divisors (see below), whose sum is σ = 97617780. Its totient is φ = 42050400.

The previous prime is 65328509. The next prime is 65328583. The reversal of 65328561 is 16582356.

65328561 is a `hidden beast` number, since 65 + 32 + 8 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 45481536 + 19847025 = 6744^2 + 4455^2 .

It is not a de Polignac number, because 65328561 - 2¹³ = 65320369 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65328661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124890 + ... + 125411.

It is an arithmetic number, because the mean of its divisors is an integer number (8134815).

Almost surely, 2^65328561 is an apocalyptic number.

It is an amenable number.

65328561 is a deficient number, since it is larger than the sum of its proper divisors (32289219).

65328561 is a wasteful number, since it uses less digits than its factorization.

65328561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250336 (or 250333 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 65328561 is about 8082.6085516991. The cubic root of 65328561 is about 402.7489010000.

The spelling of 65328561 in words is "sixty-five million, three hundred twenty-eight thousand, five hundred sixty-one".