65536661 has 4 divisors (see below), whose sum is σ = 65898924. Its totient is φ = 65174400.

The previous prime is 65536651. The next prime is 65536711. The reversal of 65536661 is 16663556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20566225 + 44970436 = 4535^2 + 6706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65536661 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65536651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180860 + ... + 181221.

It is an arithmetic number, because the mean of its divisors is an integer number (16474731).

Almost surely, 2^65536661 is an apocalyptic number.

It is an amenable number.

65536661 is a deficient number, since it is larger than the sum of its proper divisors (362263).

65536661 is a wasteful number, since it uses less digits than its factorization.

65536661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362262.

The product of its digits is 97200, while the sum is 38.

The square root of 65536661 is about 8095.4716354268. The cubic root of 65536661 is about 403.1760914433.

The spelling of 65536661 in words is "sixty-five million, five hundred thirty-six thousand, six hundred sixty-one".