66532247 has 2 divisors, whose sum is σ = 66532248. Its totient is φ = 66532246.

The previous prime is 66532241. The next prime is 66532289. The reversal of 66532247 is 74223566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66532247 - 2¹² = 66528151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66532241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33266123 + 33266124.

It is an arithmetic number, because the mean of its divisors is an integer number (33266124).

Almost surely, 2^66532247 is an apocalyptic number.

66532247 is a deficient number, since it is larger than the sum of its proper divisors (1).

66532247 is an equidigital number, since it uses as much as digits as its factorization.

66532247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 35.

The square root of 66532247 is about 8156.7301659427. The cubic root of 66532247 is about 405.2074271492.

The spelling of 66532247 in words is "sixty-six million, five hundred thirty-two thousand, two hundred forty-seven".