66807012 has 12 divisors (see below), whose sum is σ = 155883056. Its totient is φ = 22269000.

The previous prime is 66807011. The next prime is 66807023. The reversal of 66807012 is 21070866.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (66807011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2783614 + ... + 2783637.

Almost surely, 2^66807012 is an apocalyptic number.

It is an amenable number.

66807012 is an abundant number, since it is smaller than the sum of its proper divisors (89076044).

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

66807012 is a wasteful number, since it uses less digits than its factorization.

66807012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5567258 (or 5567256 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 66807012 is about 8173.5556522238. Note that the first 3 decimals coincide. The cubic root of 66807012 is about 405.7644698269.

Adding to 66807012 its reverse (21070866), we get a palindrome (87877878).

The spelling of 66807012 in words is "sixty-six million, eight hundred seven thousand, twelve".