66745660 has 12 divisors (see below), whose sum is σ = 140165928. Its totient is φ = 26698256.

The previous prime is 66745633. The next prime is 66745667. The reversal of 66745660 is 6654766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66745667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668622 + ... + 1668661.

It is an arithmetic number, because the mean of its divisors is an integer number (11680494).

Almost surely, 2^66745660 is an apocalyptic number.

It is an amenable number.

66745660 is an abundant number, since it is smaller than the sum of its proper divisors (73420268).

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

66745660 is a wasteful number, since it uses less digits than its factorization.

66745660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337292 (or 3337290 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 66745660 is about 8169.8017111800. The cubic root of 66745660 is about 405.6402209620.

The spelling of 66745660 in words is "sixty-six million, seven hundred forty-five thousand, six hundred sixty".