66303239 has 2 divisors, whose sum is σ = 66303240. Its totient is φ = 66303238.

The previous prime is 66303233. The next prime is 66303241. The reversal of 66303239 is 93230366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66303239 - 2⁸ = 66302983 is a prime.

It is a super-2 number, since 2×66303239² = 8792239003782242, which contains 22 as substring.

Together with 66303241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66303233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33151619 + 33151620.

It is an arithmetic number, because the mean of its divisors is an integer number (33151620).

Almost surely, 2^66303239 is an apocalyptic number.

66303239 is a deficient number, since it is larger than the sum of its proper divisors (1).

66303239 is an equidigital number, since it uses as much as digits as its factorization.

66303239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 32.

The square root of 66303239 is about 8142.6800870475. The cubic root of 66303239 is about 404.7419765833.

The spelling of 66303239 in words is "sixty-six million, three hundred three thousand, two hundred thirty-nine".