66224999 has 2 divisors, whose sum is σ = 66225000. Its totient is φ = 66224998.

The previous prime is 66224971. The next prime is 66225007. The reversal of 66224999 is 99942266.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66224999 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 (66226999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33112499 + 33112500.

It is an arithmetic number, because the mean of its divisors is an integer number (33112500).

Almost surely, 2^66224999 is an apocalyptic number.

66224999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66224999 is an equidigital number, since it uses as much as digits as its factorization.

66224999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 66224999 is about 8137.8743539084. The cubic root of 66224999 is about 404.5827109781.

The spelling of 66224999 in words is "sixty-six million, two hundred twenty-four thousand, nine hundred ninety-nine".