65566685 has 4 divisors (see below), whose sum is σ = 78680028. Its totient is φ = 52453344.

The previous prime is 65566681. The next prime is 65566687. The reversal of 65566685 is 58666556.

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 10004569 + 55562116 = 3163^2 + 7454^2 .

It is a cyclic number.

It is not a de Polignac number, because 65566685 - 2² = 65566681 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 (65566681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6556664 + ... + 6556673.

It is an arithmetic number, because the mean of its divisors is an integer number (19670007).

Almost surely, 2^65566685 is an apocalyptic number.

It is an amenable number.

65566685 is a deficient number, since it is larger than the sum of its proper divisors (13113343).

65566685 is a wasteful number, since it uses less digits than its factorization.

65566685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13113342.

The product of its digits is 1296000, while the sum is 47.

The square root of 65566685 is about 8097.3257931245. The cubic root of 65566685 is about 403.2376504278.

The spelling of 65566685 in words is "sixty-five million, five hundred sixty-six thousand, six hundred eighty-five".