66752219 has 2 divisors, whose sum is σ = 66752220. Its totient is φ = 66752218.

The previous prime is 66752201. The next prime is 66752221. The reversal of 66752219 is 91225766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66752219 is a prime.

It is a super-2 number, since 2×66752219² = 8911717482847922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 66752221, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66755219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33376109 + 33376110.

It is an arithmetic number, because the mean of its divisors is an integer number (33376110).

Almost surely, 2^66752219 is an apocalyptic number.

66752219 is a deficient number, since it is larger than the sum of its proper divisors (1).

66752219 is an equidigital number, since it uses as much as digits as its factorization.

66752219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 66752219 is about 8170.2031186501. The cubic root of 66752219 is about 405.6535077538.

The spelling of 66752219 in words is "sixty-six million, seven hundred fifty-two thousand, two hundred nineteen".