66662851 has 4 divisors (see below), whose sum is σ = 68961600. Its totient is φ = 64364104.

The previous prime is 66662837. The next prime is 66662941. The reversal of 66662851 is 15826666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66662851 - 2⁷ = 66662723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66662801) 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, 1149331 + ... + 1149388.

It is an arithmetic number, because the mean of its divisors is an integer number (17240400).

Almost surely, 2^66662851 is an apocalyptic number.

66662851 is a deficient number, since it is larger than the sum of its proper divisors (2298749).

66662851 is a wasteful number, since it uses less digits than its factorization.

66662851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298748.

The product of its digits is 103680, while the sum is 40.

The square root of 66662851 is about 8164.7321450247. The cubic root of 66662851 is about 405.4723970055.

The spelling of 66662851 in words is "sixty-six million, six hundred sixty-two thousand, eight hundred fifty-one".