66280851 has 24 divisors (see below), whose sum is σ = 117834080. Its totient is φ = 34960896.

The previous prime is 66280783. The next prime is 66280859. The reversal of 66280851 is 15808266.

It is a happy number.

It is not a de Polignac number, because 66280851 - 2¹⁰ = 66279827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66280859) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 39646 + ... + 41283.

Almost surely, 2^66280851 is an apocalyptic number.

66280851 is a deficient number, since it is larger than the sum of its proper divisors (51553229).

66280851 is a wasteful number, since it uses less digits than its factorization.

66280851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80955 (or 80952 counting only the distinct ones).

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

The square root of 66280851 is about 8141.3052393336. The cubic root of 66280851 is about 404.6964162980.

The spelling of 66280851 in words is "sixty-six million, two hundred eighty thousand, eight hundred fifty-one".