65666601 has 96 divisors (see below), whose sum is σ = 131459328. Its totient is φ = 30481920.

The previous prime is 65666591. The next prime is 65666621. The reversal of 65666601 is 10666656.

It is not a de Polignac number, because 65666601 - 2⁶ = 65666537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65666621) 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 95 ways as a sum of consecutive naturals, for example, 333235 + ... + 333431.

It is an arithmetic number, because the mean of its divisors is an integer number (1369368).

Almost surely, 2^65666601 is an apocalyptic number.

It is an amenable number.

65666601 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

65666601 is a wasteful number, since it uses less digits than its factorization.

65666601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 65666601 is about 8103.4931356792. The cubic root of 65666601 is about 403.4423755596.

Subtracting from 65666601 its reverse (10666656), we obtain a palindrome (54999945).

It can be divided in two parts, 65 and 666601, that added together give a palindrome (666666).

The spelling of 65666601 in words is "sixty-five million, six hundred sixty-six thousand, six hundred one".