66040606 has 4 divisors (see below), whose sum is σ = 99060912. Its totient is φ = 33020302.

The previous prime is 66040589. The next prime is 66040619. The reversal of 66040606 is 60604066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60604066 = 2 ⋅30302033.

It is a super-2 number, since 2×66040606² = 8722723281694472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16510150 + ... + 16510153.

It is an arithmetic number, because the mean of its divisors is an integer number (24765228).

Almost surely, 2^66040606 is an apocalyptic number.

66040606 is a deficient number, since it is larger than the sum of its proper divisors (33020306).

66040606 is a wasteful number, since it uses less digits than its factorization.

66040606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33020305.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66040606 is about 8126.5371469033. The cubic root of 66040606 is about 404.2068631482.

It can be divided in two parts, 6604060 and 6, that added together give a palindrome (6604066).

The spelling of 66040606 in words is "sixty-six million, forty thousand, six hundred six".