65666856 has 32 divisors (see below), whose sum is σ = 164885760. Its totient is φ = 21793152.

The previous prime is 65666851. The next prime is 65666857. The reversal of 65666856 is 65866656.

It is not an unprimeable number, because it can be changed into a prime (65666851) by changing a digit.

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, 280 + ... + 11463.

It is an arithmetic number, because the mean of its divisors is an integer number (5152680).

Almost surely, 2^65666856 is an apocalyptic number.

It is an amenable number.

65666856 is an abundant number, since it is smaller than the sum of its proper divisors (99218904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65666856 is a wasteful number, since it uses less digits than its factorization.

65666856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11985 (or 11981 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The square root of 65666856 is about 8103.5088696194. The cubic root of 65666856 is about 403.4428977819.

The spelling of 65666856 in words is "sixty-five million, six hundred sixty-six thousand, eight hundred fifty-six".