66605008 has 20 divisors (see below), whose sum is σ = 129343780. Its totient is φ = 33225984.

The previous prime is 66604999. The next prime is 66605009. The reversal of 66605008 is 80050666.

It can be written as a sum of positive squares in 2 ways, for example, as 32171584 + 34433424 = 5672^2 + 5868^2 .

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2758 + ... + 11866.

It is an arithmetic number, because the mean of its divisors is an integer number (6467189).

Almost surely, 2^66605008 is an apocalyptic number.

It is an amenable number.

66605008 is a deficient number, since it is larger than the sum of its proper divisors (62738772).

66605008 is a wasteful number, since it uses less digits than its factorization.

66605008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9574 (or 9568 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 66605008 is about 8161.1891290424. The cubic root of 66605008 is about 405.3550876578.

The spelling of 66605008 in words is "sixty-six million, six hundred five thousand, eight".