66508812 has 72 divisors (see below), whose sum is σ = 172907280. Its totient is φ = 21548160.

The previous prime is 66508789. The next prime is 66508817. The reversal of 66508812 is 21880566.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (66508817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 367362 + ... + 367542.

It is an arithmetic number, because the mean of its divisors is an integer number (2401490).

Almost surely, 2^66508812 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 66508812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86453640).

66508812 is an abundant number, since it is smaller than the sum of its proper divisors (106398468).

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

66508812 is a wasteful number, since it uses less digits than its factorization.

66508812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 66508812 is about 8155.2934956383. The cubic root of 66508812 is about 405.1598454544.

The spelling of 66508812 in words is "sixty-six million, five hundred eight thousand, eight hundred twelve".