65566500665 has 8 divisors (see below), whose sum is σ = 78681930120. Its totient is φ = 52451780992.

The previous prime is 65566500631. The next prime is 65566500673. The reversal of 65566500665 is 56600566556.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15403043881 + 50163456784 = 124109^2 + 223972^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65566500665 - 2⁸ = 65566500409 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52991 + ... + 365979.

It is an arithmetic number, because the mean of its divisors is an integer number (9835241265).

Almost surely, 2^65566500665 is an apocalyptic number.

It is an amenable number.

65566500665 is a deficient number, since it is larger than the sum of its proper divisors (13115429455).

65566500665 is a wasteful number, since it uses less digits than its factorization.

65566500665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354891.

The product of its (nonzero) digits is 4860000, while the sum is 50.

The spelling of 65566500665 in words is "sixty-five billion, five hundred sixty-six million, five hundred thousand, six hundred sixty-five".