66725117 has 2 divisors, whose sum is σ = 66725118. Its totient is φ = 66725116.

The previous prime is 66725089. The next prime is 66725123. The reversal of 66725117 is 71152766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59892121 + 6832996 = 7739^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 66725117 - 2⁶ = 66725053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66725177) 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, 33362558 + 33362559.

It is an arithmetic number, because the mean of its divisors is an integer number (33362559).

Almost surely, 2^66725117 is an apocalyptic number.

It is an amenable number.

66725117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66725117 is an equidigital number, since it uses as much as digits as its factorization.

66725117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 35.

The square root of 66725117 is about 8168.5443623696. The cubic root of 66725117 is about 405.5986006673.

The spelling of 66725117 in words is "sixty-six million, seven hundred twenty-five thousand, one hundred seventeen".