66089857 has 2 divisors, whose sum is σ = 66089858. Its totient is φ = 66089856.

The previous prime is 66089819. The next prime is 66089917. The reversal of 66089857 is 75898066.

66089857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66080641 + 9216 = 8129^2 + 96^2 .

It is a cyclic number.

It is not a de Polignac number, because 66089857 - 2⁷ = 66089729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66089857.

It is not a weakly prime, because it can be changed into another prime (66089957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33044928 + 33044929.

It is an arithmetic number, because the mean of its divisors is an integer number (33044929).

Almost surely, 2^66089857 is an apocalyptic number.

It is an amenable number.

66089857 is a deficient number, since it is larger than the sum of its proper divisors (1).

66089857 is an equidigital number, since it uses as much as digits as its factorization.

66089857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 66089857 is about 8129.5668396293. The cubic root of 66089857 is about 404.3073197544.

The spelling of 66089857 in words is "sixty-six million, eighty-nine thousand, eight hundred fifty-seven".