66536243 has 2 divisors, whose sum is σ = 66536244. Its totient is φ = 66536242.

The previous prime is 66536227. The next prime is 66536291. The reversal of 66536243 is 34263566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66536243 - 2⁴ = 66536227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66536843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33268121 + 33268122.

It is an arithmetic number, because the mean of its divisors is an integer number (33268122).

Almost surely, 2^66536243 is an apocalyptic number.

66536243 is a deficient number, since it is larger than the sum of its proper divisors (1).

66536243 is an equidigital number, since it uses as much as digits as its factorization.

66536243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 35.

The square root of 66536243 is about 8156.9751133616. The cubic root of 66536243 is about 405.2155393882.

The spelling of 66536243 in words is "sixty-six million, five hundred thirty-six thousand, two hundred forty-three".