66260399 has 2 divisors, whose sum is σ = 66260400. Its totient is φ = 66260398.

The previous prime is 66260351. The next prime is 66260417. The reversal of 66260399 is 99306266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66260399 - 2⁸ = 66260143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66260329) 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, 33130199 + 33130200.

It is an arithmetic number, because the mean of its divisors is an integer number (33130200).

Almost surely, 2^66260399 is an apocalyptic number.

66260399 is a deficient number, since it is larger than the sum of its proper divisors (1).

66260399 is an equidigital number, since it uses as much as digits as its factorization.

66260399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 66260399 is about 8140.0490784761. The cubic root of 66260399 is about 404.6547868659.

The spelling of 66260399 in words is "sixty-six million, two hundred sixty thousand, three hundred ninety-nine".