66860279 has 2 divisors, whose sum is σ = 66860280. Its totient is φ = 66860278.

The previous prime is 66860267. The next prime is 66860291. The reversal of 66860279 is 97206866.

It is a balanced prime because it is at equal distance from previous prime (66860267) and next prime (66860291).

It is a cyclic number.

It is not a de Polignac number, because 66860279 - 2⁴ = 66860263 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 (66860579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33430139 + 33430140.

It is an arithmetic number, because the mean of its divisors is an integer number (33430140).

Almost surely, 2^66860279 is an apocalyptic number.

66860279 is a deficient number, since it is larger than the sum of its proper divisors (1).

66860279 is an equidigital number, since it uses as much as digits as its factorization.

66860279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 66860279 is about 8176.8134991572. The cubic root of 66860279 is about 405.8722834305.

The spelling of 66860279 in words is "sixty-six million, eight hundred sixty thousand, two hundred seventy-nine".