66285865 has 8 divisors (see below), whose sum is σ = 80437320. Its totient is φ = 52432512.

The previous prime is 66285853. The next prime is 66285883. The reversal of 66285865 is 56858266.

It can be written as a sum of positive squares in 4 ways, for example, as 529984 + 65755881 = 728^2 + 8109^2 .

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 66285865 - 2⁹ = 66285353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74034 + ... + 74923.

It is an arithmetic number, because the mean of its divisors is an integer number (10054665).

Almost surely, 2^66285865 is an apocalyptic number.

It is an amenable number.

66285865 is a deficient number, since it is larger than the sum of its proper divisors (14151455).

66285865 is a wasteful number, since it uses less digits than its factorization.

66285865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149051.

The product of its digits is 691200, while the sum is 46.

The square root of 66285865 is about 8141.6131693909. The cubic root of 66285865 is about 404.7066208374.

The spelling of 66285865 in words is "sixty-six million, two hundred eighty-five thousand, eight hundred sixty-five".