66716808 has 64 divisors (see below), whose sum is σ = 170501760. Its totient is φ = 21751296.

The previous prime is 66716807. The next prime is 66716821. The reversal of 66716808 is 80861766.

It is a super-2 number, since 2×66716808² = 8902264939417728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66716808.

It is not an unprimeable number, because it can be changed into a prime (66716807) 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 15 ways as a sum of consecutive naturals, for example, 338566 + ... + 338762.

It is an arithmetic number, because the mean of its divisors is an integer number (2664090).

Almost surely, 2^66716808 is an apocalyptic number.

It is an amenable number.

66716808 is an abundant number, since it is smaller than the sum of its proper divisors (103784952).

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

66716808 is a wasteful number, since it uses less digits than its factorization.

66716808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 66716808 is about 8168.0357491872. The cubic root of 66716808 is about 405.5817641354.

The spelling of 66716808 in words is "sixty-six million, seven hundred sixteen thousand, eight hundred eight".