66532201 has 2 divisors, whose sum is σ = 66532202. Its totient is φ = 66532200.

The previous prime is 66532189. The next prime is 66532241. The reversal of 66532201 is 10223566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65853225 + 678976 = 8115^2 + 824^2 .

It is a cyclic number.

It is not a de Polignac number, because 66532201 - 2²³ = 58143593 is a prime.

It is not a weakly prime, because it can be changed into another prime (66532241) 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, 33266100 + 33266101.

It is an arithmetic number, because the mean of its divisors is an integer number (33266101).

Almost surely, 2^66532201 is an apocalyptic number.

It is an amenable number.

66532201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66532201 is an equidigital number, since it uses as much as digits as its factorization.

66532201 is an odious number, because the sum of its binary digits is odd.

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

The square root of 66532201 is about 8156.7273461849. The cubic root of 66532201 is about 405.2073337632.

Adding to 66532201 its reverse (10223566), we get a palindrome (76755767).

The spelling of 66532201 in words is "sixty-six million, five hundred thirty-two thousand, two hundred one".