65666506 has 16 divisors (see below), whose sum is σ = 99813024. Its totient is φ = 32398704.

The previous prime is 65666479. The next prime is 65666509. The reversal of 65666506 is 60566656.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (65666509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50541 + ... + 51823.

It is an arithmetic number, because the mean of its divisors is an integer number (6238314).

Almost surely, 2^65666506 is an apocalyptic number.

65666506 is a deficient number, since it is larger than the sum of its proper divisors (34146518).

65666506 is a wasteful number, since it uses less digits than its factorization.

65666506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 65666506 is about 8103.4872740074. The cubic root of 65666506 is about 403.4421810059.

It can be divided in two parts, 6566650 and 6, that added together give a palindrome (6566656).

The spelling of 65666506 in words is "sixty-five million, six hundred sixty-six thousand, five hundred six".