66827797 has 2 divisors, whose sum is σ = 66827798. Its totient is φ = 66827796.

The previous prime is 66827779. The next prime is 66827801. The reversal of 66827797 is 79772866.

It is a happy number.

Together with previous prime (66827779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49196196 + 17631601 = 7014^2 + 4199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66827797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66827767) 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 as a sum of consecutive naturals, namely, 33413898 + 33413899.

It is an arithmetic number, because the mean of its divisors is an integer number (33413899).

Almost surely, 2^66827797 is an apocalyptic number.

It is an amenable number.

66827797 is a deficient number, since it is larger than the sum of its proper divisors (1).

66827797 is an equidigital number, since it uses as much as digits as its factorization.

66827797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 52.

The square root of 66827797 is about 8174.8270318093. The cubic root of 66827797 is about 405.8065459492.

The spelling of 66827797 in words is "sixty-six million, eight hundred twenty-seven thousand, seven hundred ninety-seven".