66204319 has 2 divisors, whose sum is σ = 66204320. Its totient is φ = 66204318.

The previous prime is 66204317. The next prime is 66204331. The reversal of 66204319 is 91340266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66204319 - 2¹ = 66204317 is a prime.

It is a super-2 number, since 2×66204319² = 8766023708507522, which contains 22 as substring.

Together with 66204317, 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 (66204317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33102159 + 33102160.

It is an arithmetic number, because the mean of its divisors is an integer number (33102160).

Almost surely, 2^66204319 is an apocalyptic number.

66204319 is a deficient number, since it is larger than the sum of its proper divisors (1).

66204319 is an equidigital number, since it uses as much as digits as its factorization.

66204319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66204319 is about 8136.6036526305. The cubic root of 66204319 is about 404.5405937433.

The spelling of 66204319 in words is "sixty-six million, two hundred four thousand, three hundred nineteen".