66206606 has 4 divisors (see below), whose sum is σ = 99309912. Its totient is φ = 33103302.

The previous prime is 66206603. The next prime is 66206617. The reversal of 66206606 is 60660266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60660266 = 2 ⋅30330133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16551650 + ... + 16551653.

It is an arithmetic number, because the mean of its divisors is an integer number (24827478).

Almost surely, 2^66206606 is an apocalyptic number.

66206606 is a deficient number, since it is larger than the sum of its proper divisors (33103306).

66206606 is a wasteful number, since it uses less digits than its factorization.

66206606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33103305.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 66206606 is about 8136.7441891705. The cubic root of 66206606 is about 404.5452519171.

The spelling of 66206606 in words is "sixty-six million, two hundred six thousand, six hundred six".