66608380 has 24 divisors (see below), whose sum is σ = 148106448. Its totient is φ = 25075968.

The previous prime is 66608369. The next prime is 66608393. The reversal of 66608380 is 8380666.

It is a congruent number.

It is an unprimeable number.

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, 97614 + ... + 98293.

It is an arithmetic number, because the mean of its divisors is an integer number (6171102).

Almost surely, 2^66608380 is an apocalyptic number.

It is an amenable number.

66608380 is an abundant number, since it is smaller than the sum of its proper divisors (81498068).

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

66608380 is a wasteful number, since it uses less digits than its factorization.

66608380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195933 (or 195931 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 66608380 is about 8161.3957139695. The cubic root of 66608380 is about 405.3619281559.

The spelling of 66608380 in words is "sixty-six million, six hundred eight thousand, three hundred eighty".