66722479 has 2 divisors, whose sum is σ = 66722480. Its totient is φ = 66722478.

The previous prime is 66722443. The next prime is 66722527. The reversal of 66722479 is 97422766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66722479 - 2⁷ = 66722351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66422479) 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, 33361239 + 33361240.

It is an arithmetic number, because the mean of its divisors is an integer number (33361240).

Almost surely, 2^66722479 is an apocalyptic number.

66722479 is a deficient number, since it is larger than the sum of its proper divisors (1).

66722479 is an equidigital number, since it uses as much as digits as its factorization.

66722479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 43.

The square root of 66722479 is about 8168.3828876957. The cubic root of 66722479 is about 405.5932554377.

The spelling of 66722479 in words is "sixty-six million, seven hundred twenty-two thousand, four hundred seventy-nine".