66550608 has 60 divisors (see below), whose sum is σ = 186863040. Its totient is φ = 22110528.

The previous prime is 66550577. The next prime is 66550609. The reversal of 66550608 is 80605566.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550609) 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 11 ways as a sum of consecutive naturals, for example, 59785 + ... + 60887.

It is an arithmetic number, because the mean of its divisors is an integer number (3114384).

Almost surely, 2^66550608 is an apocalyptic number.

It is an amenable number.

66550608 is an abundant number, since it is smaller than the sum of its proper divisors (120312432).

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

66550608 is a wasteful number, since it uses less digits than its factorization.

66550608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536 (or 1527 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 66550608 is about 8157.8556005852. The cubic root of 66550608 is about 405.2446989465.

The spelling of 66550608 in words is "sixty-six million, five hundred fifty thousand, six hundred eight".