65720117 has 2 divisors, whose sum is σ = 65720118. Its totient is φ = 65720116.

The previous prime is 65720071. The next prime is 65720129. The reversal of 65720117 is 71102756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58354321 + 7365796 = 7639^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 65720117 - 2⁸ = 65719861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65720117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65723117) 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, 32860058 + 32860059.

It is an arithmetic number, because the mean of its divisors is an integer number (32860059).

Almost surely, 2^65720117 is an apocalyptic number.

It is an amenable number.

65720117 is a deficient number, since it is larger than the sum of its proper divisors (1).

65720117 is an equidigital number, since it uses as much as digits as its factorization.

65720117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 65720117 is about 8106.7944959768. The cubic root of 65720117 is about 403.5519429769.

The spelling of 65720117 in words is "sixty-five million, seven hundred twenty thousand, one hundred seventeen".