66748559 has 2 divisors, whose sum is σ = 66748560. Its totient is φ = 66748558.

The previous prime is 66748547. The next prime is 66748567. The reversal of 66748559 is 95584766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66748559 - 2⁴ = 66748543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66748589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33374279 + 33374280.

It is an arithmetic number, because the mean of its divisors is an integer number (33374280).

Almost surely, 2^66748559 is an apocalyptic number.

66748559 is a deficient number, since it is larger than the sum of its proper divisors (1).

66748559 is an equidigital number, since it uses as much as digits as its factorization.

66748559 is an evil number, because the sum of its binary digits is even.

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

The square root of 66748559 is about 8169.9791309403. The cubic root of 66748559 is about 405.6460936733.

The spelling of 66748559 in words is "sixty-six million, seven hundred forty-eight thousand, five hundred fifty-nine".