66857459 has 2 divisors, whose sum is σ = 66857460. Its totient is φ = 66857458.

The previous prime is 66857431. The next prime is 66857477. The reversal of 66857459 is 95475866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66857459 - 2¹² = 66853363 is a prime.

It is not a weakly prime, because it can be changed into another prime (66857419) 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, 33428729 + 33428730.

It is an arithmetic number, because the mean of its divisors is an integer number (33428730).

Almost surely, 2^66857459 is an apocalyptic number.

66857459 is a deficient number, since it is larger than the sum of its proper divisors (1).

66857459 is an equidigital number, since it uses as much as digits as its factorization.

66857459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 50.

The square root of 66857459 is about 8176.6410585276. The cubic root of 66857459 is about 405.8665771230.

The spelling of 66857459 in words is "sixty-six million, eight hundred fifty-seven thousand, four hundred fifty-nine".