65666063 has 4 divisors (see below), whose sum is σ = 67930440. Its totient is φ = 63401688.

The previous prime is 65666057. The next prime is 65666089. The reversal of 65666063 is 36066656.

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

It is a cyclic number.

It is not a de Polignac number, because 65666063 - 2²² = 61471759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65666023) 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 3 ways as a sum of consecutive naturals, for example, 1132145 + ... + 1132202.

It is an arithmetic number, because the mean of its divisors is an integer number (16982610).

Almost surely, 2^65666063 is an apocalyptic number.

65666063 is a deficient number, since it is larger than the sum of its proper divisors (2264377).

65666063 is a wasteful number, since it uses less digits than its factorization.

65666063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264376.

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 65666063 is about 8103.4599400503. The cubic root of 65666063 is about 403.4412737687.

The spelling of 65666063 in words is "sixty-five million, six hundred sixty-six thousand, sixty-three".