66845827 has 4 divisors (see below), whose sum is σ = 69002176. Its totient is φ = 64689480.

The previous prime is 66845803. The next prime is 66845837. The reversal of 66845827 is 72854866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66845827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66845837) 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, 1078128 + ... + 1078189.

It is an arithmetic number, because the mean of its divisors is an integer number (17250544).

Almost surely, 2^66845827 is an apocalyptic number.

66845827 is a deficient number, since it is larger than the sum of its proper divisors (2156349).

66845827 is a wasteful number, since it uses less digits than its factorization.

66845827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156348.

The product of its digits is 645120, while the sum is 46.

The square root of 66845827 is about 8175.9297330640. The cubic root of 66845827 is about 405.8430379203.

The spelling of 66845827 in words is "sixty-six million, eight hundred forty-five thousand, eight hundred twenty-seven".