66032521 has 2 divisors, whose sum is σ = 66032522. Its totient is φ = 66032520.

The previous prime is 66032513. The next prime is 66032557. The reversal of 66032521 is 12523066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39200121 + 26832400 = 6261^2 + 5180^2 .

It is a cyclic number.

It is not a de Polignac number, because 66032521 - 2³ = 66032513 is a prime.

It is not a weakly prime, because it can be changed into another prime (66032501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33016260 + 33016261.

It is an arithmetic number, because the mean of its divisors is an integer number (33016261).

Almost surely, 2^66032521 is an apocalyptic number.

It is an amenable number.

66032521 is a deficient number, since it is larger than the sum of its proper divisors (1).

66032521 is an equidigital number, since it uses as much as digits as its factorization.

66032521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 66032521 is about 8126.0396873262. The cubic root of 66032521 is about 404.1903675099.

Adding to 66032521 its reverse (12523066), we get a palindrome (78555587).

The spelling of 66032521 in words is "sixty-six million, thirty-two thousand, five hundred twenty-one".