66516606 has 64 divisors (see below), whose sum is σ = 167596800. Its totient is φ = 19385568.

The previous prime is 66516589. The next prime is 66516613. The reversal of 66516606 is 60661566.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10845 + ... + 15831.

It is an arithmetic number, because the mean of its divisors is an integer number (2618700).

Almost surely, 2^66516606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66516606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83798400).

66516606 is an abundant number, since it is smaller than the sum of its proper divisors (101080194).

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

66516606 is a wasteful number, since it uses less digits than its factorization.

66516606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030 (or 5024 counting only the distinct ones).

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

The square root of 66516606 is about 8155.7713307817. The cubic root of 66516606 is about 405.1756713898.

It can be divided in two parts, 665 and 16606, that added together give a palindrome (17271).

The spelling of 66516606 in words is "sixty-six million, five hundred sixteen thousand, six hundred six".