66923317 has 2 divisors, whose sum is σ = 66923318. Its totient is φ = 66923316.

The previous prime is 66923309. The next prime is 66923369. The reversal of 66923317 is 71332966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53129521 + 13793796 = 7289^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 66923317 - 2³ = 66923309 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 (66923617) 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, 33461658 + 33461659.

It is an arithmetic number, because the mean of its divisors is an integer number (33461659).

Almost surely, 2^66923317 is an apocalyptic number.

It is an amenable number.

66923317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66923317 is an equidigital number, since it uses as much as digits as its factorization.

66923317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 66923317 is about 8180.6672710727. The cubic root of 66923317 is about 405.9997998009. Note that the first 3 decimals are identical.

The spelling of 66923317 in words is "sixty-six million, nine hundred twenty-three thousand, three hundred seventeen".