66616259 has 2 divisors, whose sum is σ = 66616260. Its totient is φ = 66616258.

The previous prime is 66616201. The next prime is 66616271. The reversal of 66616259 is 95261666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66616259 - 2²⁰ = 65567683 is a prime.

It is not a weakly prime, because it can be changed into another prime (66616279) 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, 33308129 + 33308130.

It is an arithmetic number, because the mean of its divisors is an integer number (33308130).

Almost surely, 2^66616259 is an apocalyptic number.

66616259 is a deficient number, since it is larger than the sum of its proper divisors (1).

66616259 is an equidigital number, since it uses as much as digits as its factorization.

66616259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 66616259 is about 8161.8783989962. The cubic root of 66616259 is about 405.3779107330.

The spelling of 66616259 in words is "sixty-six million, six hundred sixteen thousand, two hundred fifty-nine".