66816888 has 32 divisors (see below), whose sum is σ = 170197200. Its totient is φ = 21851648.

The previous prime is 66816877. The next prime is 66816907. The reversal of 66816888 is 88861866.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 66816888.

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, 24993 + ... + 27536.

Almost surely, 2^66816888 is an apocalyptic number.

It is an amenable number.

66816888 is an abundant number, since it is smaller than the sum of its proper divisors (103380312).

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

66816888 is a wasteful number, since it uses less digits than its factorization.

66816888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52591 (or 52587 counting only the distinct ones).

The product of its digits is 884736, while the sum is 51.

The square root of 66816888 is about 8174.1597733345. The cubic root of 66816888 is about 405.7844633991.

The spelling of 66816888 in words is "sixty-six million, eight hundred sixteen thousand, eight hundred eighty-eight".