66605005 has 8 divisors (see below), whose sum is σ = 80373600. Its totient is φ = 52985616.

The previous prime is 66604999. The next prime is 66605009. The reversal of 66605005 is 50050666.

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

It is a cyclic number.

It is not a de Polignac number, because 66605005 - 2⁵ = 66604973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605009) 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 7 ways as a sum of consecutive naturals, for example, 36315 + ... + 38104.

It is an arithmetic number, because the mean of its divisors is an integer number (10046700).

Almost surely, 2^66605005 is an apocalyptic number.

It is an amenable number.

66605005 is a deficient number, since it is larger than the sum of its proper divisors (13768595).

66605005 is a wasteful number, since it uses less digits than its factorization.

66605005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74603.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 66605005 is about 8161.1889452457. The cubic root of 66605005 is about 405.3550815719.

The spelling of 66605005 in words is "sixty-six million, six hundred five thousand, five".