66745666 has 16 divisors (see below), whose sum is σ = 111299328. Its totient is φ = 29811600.

The previous prime is 66745633. The next prime is 66745667. The reversal of 66745666 is 66654766.

It is not an unprimeable number, because it can be changed into a prime (66745667) 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, 40600 + ... + 42211.

It is an arithmetic number, because the mean of its divisors is an integer number (6956208).

Almost surely, 2^66745666 is an apocalyptic number.

66745666 is a deficient number, since it is larger than the sum of its proper divisors (44553662).

66745666 is a wasteful number, since it uses less digits than its factorization.

66745666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82857.

The product of its digits is 1088640, while the sum is 46.

The square root of 66745666 is about 8169.8020783860. The cubic root of 66745666 is about 405.6402331168.

The spelling of 66745666 in words is "sixty-six million, seven hundred forty-five thousand, six hundred sixty-six".