66855827 has 2 divisors, whose sum is σ = 66855828. Its totient is φ = 66855826.

The previous prime is 66855823. The next prime is 66855881. The reversal of 66855827 is 72855866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66855827 - 2² = 66855823 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66855823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427913 + 33427914.

It is an arithmetic number, because the mean of its divisors is an integer number (33427914).

Almost surely, 2^66855827 is an apocalyptic number.

66855827 is a deficient number, since it is larger than the sum of its proper divisors (1).

66855827 is an equidigital number, since it uses as much as digits as its factorization.

66855827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 47.

The square root of 66855827 is about 8176.5412614381. The cubic root of 66855827 is about 405.8632746760.

The spelling of 66855827 in words is "sixty-six million, eight hundred fifty-five thousand, eight hundred twenty-seven".