66581306 has 8 divisors (see below), whose sum is σ = 108951264. Its totient is φ = 30264220.

The previous prime is 66581287. The next prime is 66581309. The reversal of 66581306 is 60318566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66581309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1513190 + ... + 1513233.

It is an arithmetic number, because the mean of its divisors is an integer number (13618908).

Almost surely, 2^66581306 is an apocalyptic number.

66581306 is a deficient number, since it is larger than the sum of its proper divisors (42369958).

66581306 is a wasteful number, since it uses less digits than its factorization.

66581306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026436.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 66581306 is about 8159.7368830128. The cubic root of 66581306 is about 405.3069988506.

The spelling of 66581306 in words is "sixty-six million, five hundred eighty-one thousand, three hundred six".