66851008 has 84 divisors (see below), whose sum is σ = 157246320. Its totient is φ = 27620352.

The previous prime is 66850999. The next prime is 66851009. The reversal of 66851008 is 80015866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66851009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613258 + ... + 613366.

It is an arithmetic number, because the mean of its divisors is an integer number (1871980).

Almost surely, 2^66851008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66851008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78623160).

66851008 is an abundant number, since it is smaller than the sum of its proper divisors (90395312).

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

66851008 is a wasteful number, since it uses less digits than its factorization.

66851008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 66851008 is about 8176.2465716244. The cubic root of 66851008 is about 405.8535228354.

The spelling of 66851008 in words is "sixty-six million, eight hundred fifty-one thousand, eight".