66858377 has 2 divisors, whose sum is σ = 66858378. Its totient is φ = 66858376.

The previous prime is 66858361. The next prime is 66858419. The reversal of 66858377 is 77385866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47665216 + 19193161 = 6904^2 + 4381^2 .

It is a cyclic number.

It is not a de Polignac number, because 66858377 - 2⁴ = 66858361 is a prime.

It is not a weakly prime, because it can be changed into another prime (66858307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33429188 + 33429189.

It is an arithmetic number, because the mean of its divisors is an integer number (33429189).

Almost surely, 2^66858377 is an apocalyptic number.

It is an amenable number.

66858377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66858377 is an equidigital number, since it uses as much as digits as its factorization.

66858377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 50.

The square root of 66858377 is about 8176.6971938552. The cubic root of 66858377 is about 405.8684347258.

The spelling of 66858377 in words is "sixty-six million, eight hundred fifty-eight thousand, three hundred seventy-seven".