66680827 has 4 divisors (see below), whose sum is σ = 68099616. Its totient is φ = 65262040.

The previous prime is 66680821. The next prime is 66680863. The reversal of 66680827 is 72808666.

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 66680827 - 2¹¹ = 66678779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66680821) 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, 709324 + ... + 709417.

It is an arithmetic number, because the mean of its divisors is an integer number (17024904).

Almost surely, 2^66680827 is an apocalyptic number.

66680827 is a deficient number, since it is larger than the sum of its proper divisors (1418789).

66680827 is a wasteful number, since it uses less digits than its factorization.

66680827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418788.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 66680827 is about 8165.8329030173. The cubic root of 66680827 is about 405.5088396751.

The spelling of 66680827 in words is "sixty-six million, six hundred eighty thousand, eight hundred twenty-seven".