66128479 has 2 divisors, whose sum is σ = 66128480. Its totient is φ = 66128478.

The previous prime is 66128459. The next prime is 66128527. The reversal of 66128479 is 97482166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66128479 - 2¹³ = 66120287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66128459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33064239 + 33064240.

It is an arithmetic number, because the mean of its divisors is an integer number (33064240).

Almost surely, 2^66128479 is an apocalyptic number.

66128479 is a deficient number, since it is larger than the sum of its proper divisors (1).

66128479 is an equidigital number, since it uses as much as digits as its factorization.

66128479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 66128479 is about 8131.9418960049. The cubic root of 66128479 is about 404.3860616231.

The spelling of 66128479 in words is "sixty-six million, one hundred twenty-eight thousand, four hundred seventy-nine".