66898319 has 2 divisors, whose sum is σ = 66898320. Its totient is φ = 66898318.

The previous prime is 66898313. The next prime is 66898327. The reversal of 66898319 is 91389866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66898319 - 2²⁰ = 65849743 is a prime.

It is a super-2 number, since 2×66898319² = 8950770170051522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66898313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33449159 + 33449160.

It is an arithmetic number, because the mean of its divisors is an integer number (33449160).

Almost surely, 2^66898319 is an apocalyptic number.

66898319 is a deficient number, since it is larger than the sum of its proper divisors (1).

66898319 is an equidigital number, since it uses as much as digits as its factorization.

66898319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 66898319 is about 8179.1392578926. The cubic root of 66898319 is about 405.9492422006.

The spelling of 66898319 in words is "sixty-six million, eight hundred ninety-eight thousand, three hundred nineteen".