66746660 has 12 divisors (see below), whose sum is σ = 140168028. Its totient is φ = 26698656.

The previous prime is 66746653. The next prime is 66746671. The reversal of 66746660 is 6664766.

It can be written as a sum of positive squares in 2 ways, for example, as 17774656 + 48972004 = 4216^2 + 6998^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668647 + ... + 1668686.

It is an arithmetic number, because the mean of its divisors is an integer number (11680669).

Almost surely, 2^66746660 is an apocalyptic number.

It is an amenable number.

66746660 is an abundant number, since it is smaller than the sum of its proper divisors (73421368).

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

66746660 is a wasteful number, since it uses less digits than its factorization.

66746660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337342 (or 3337340 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 66746660 is about 8169.8629119466. The cubic root of 66746660 is about 405.6422467526.

The spelling of 66746660 in words is "sixty-six million, seven hundred forty-six thousand, six hundred sixty".