66344617 has 2 divisors, whose sum is σ = 66344618. Its totient is φ = 66344616.

The previous prime is 66344573. The next prime is 66344633. The reversal of 66344617 is 71644366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66324736 + 19881 = 8144^2 + 141^2 .

It is a cyclic number.

It is not a de Polignac number, because 66344617 - 2¹¹ = 66342569 is a prime.

It is not a weakly prime, because it can be changed into another prime (66344917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33172308 + 33172309.

It is an arithmetic number, because the mean of its divisors is an integer number (33172309).

Almost surely, 2^66344617 is an apocalyptic number.

It is an amenable number.

66344617 is a deficient number, since it is larger than the sum of its proper divisors (1).

66344617 is an equidigital number, since it uses as much as digits as its factorization.

66344617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 37.

The square root of 66344617 is about 8145.2205003916. The cubic root of 66344617 is about 404.8261551298.

It can be divided in two parts, 66 and 344617, that multiplied together give a palindrome (22744722).

The spelling of 66344617 in words is "sixty-six million, three hundred forty-four thousand, six hundred seventeen".