66528571 has 2 divisors, whose sum is σ = 66528572. Its totient is φ = 66528570.

The previous prime is 66528563. The next prime is 66528607. The reversal of 66528571 is 17582566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66528571 - 2³ = 66528563 is a prime.

It is not a weakly prime, because it can be changed into another prime (66528551) 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, 33264285 + 33264286.

It is an arithmetic number, because the mean of its divisors is an integer number (33264286).

Almost surely, 2^66528571 is an apocalyptic number.

66528571 is a deficient number, since it is larger than the sum of its proper divisors (1).

66528571 is an equidigital number, since it uses as much as digits as its factorization.

66528571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The square root of 66528571 is about 8156.5048274368. The cubic root of 66528571 is about 405.1999642521.

The spelling of 66528571 in words is "sixty-six million, five hundred twenty-eight thousand, five hundred seventy-one".