66528213 has 16 divisors (see below), whose sum is σ = 93436416. Its totient is φ = 42022640.

The previous prime is 66528173. The next prime is 66528227. The reversal of 66528213 is 31282566.

It is a cyclic number.

It is not a de Polignac number, because 66528213 - 2⁶ = 66528149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66528283) 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 in 15 ways as a sum of consecutive naturals, for example, 2878 + ... + 11888.

It is an arithmetic number, because the mean of its divisors is an integer number (5839776).

Almost surely, 2^66528213 is an apocalyptic number.

It is an amenable number.

66528213 is a deficient number, since it is larger than the sum of its proper divisors (26908203).

66528213 is a wasteful number, since it uses less digits than its factorization.

66528213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9144.

The product of its digits is 17280, while the sum is 33.

The square root of 66528213 is about 8156.4828817328. The cubic root of 66528213 is about 405.1992374374.

The spelling of 66528213 in words is "sixty-six million, five hundred twenty-eight thousand, two hundred thirteen".