66668479 has 2 divisors, whose sum is σ = 66668480. Its totient is φ = 66668478.

The previous prime is 66668449. The next prime is 66668519. The reversal of 66668479 is 97486666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66668479 - 2⁷ = 66668351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66668429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33334239 + 33334240.

It is an arithmetic number, because the mean of its divisors is an integer number (33334240).

Almost surely, 2^66668479 is an apocalyptic number.

66668479 is a deficient number, since it is larger than the sum of its proper divisors (1).

66668479 is an equidigital number, since it uses as much as digits as its factorization.

66668479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 52.

The square root of 66668479 is about 8165.0767908208. The cubic root of 66668479 is about 405.4838073307.

The spelling of 66668479 in words is "sixty-six million, six hundred sixty-eight thousand, four hundred seventy-nine".