66800012 has 6 divisors (see below), whose sum is σ = 116900028. Its totient is φ = 33400004.

The previous prime is 66800011. The next prime is 66800017. The reversal of 66800012 is 21000866.

It is a super-3 number, since 3×66800012³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66800011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8349998 + ... + 8350005.

It is an arithmetic number, because the mean of its divisors is an integer number (19483338).

Almost surely, 2^66800012 is an apocalyptic number.

It is an amenable number.

66800012 is a deficient number, since it is larger than the sum of its proper divisors (50100016).

66800012 is a wasteful number, since it uses less digits than its factorization.

66800012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16700007 (or 16700005 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 66800012 is about 8173.1274307942. The cubic root of 66800012 is about 405.7502974099.

Adding to 66800012 its reverse (21000866), we get a palindrome (87800878).

The spelling of 66800012 in words is "sixty-six million, eight hundred thousand, twelve".