66478597 has 2 divisors, whose sum is σ = 66478598. Its totient is φ = 66478596.

The previous prime is 66478553. The next prime is 66478609. The reversal of 66478597 is 79587466.

It is a happy number.

66478597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65836996 + 641601 = 8114^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 66478597 - 2¹⁹ = 65954309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66478547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33239298 + 33239299.

It is an arithmetic number, because the mean of its divisors is an integer number (33239299).

Almost surely, 2^66478597 is an apocalyptic number.

It is an amenable number.

66478597 is a deficient number, since it is larger than the sum of its proper divisors (1).

66478597 is an equidigital number, since it uses as much as digits as its factorization.

66478597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The square root of 66478597 is about 8153.4408074138. The cubic root of 66478597 is about 405.0984813601.

The spelling of 66478597 in words is "sixty-six million, four hundred seventy-eight thousand, five hundred ninety-seven".