66850439 has 2 divisors, whose sum is σ = 66850440. Its totient is φ = 66850438.

The previous prime is 66850429. The next prime is 66850447. The reversal of 66850439 is 93405866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66850439 - 2¹² = 66846343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66850396 and 66850405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66850429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33425219 + 33425220.

It is an arithmetic number, because the mean of its divisors is an integer number (33425220).

Almost surely, 2^66850439 is an apocalyptic number.

66850439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66850439 is an equidigital number, since it uses as much as digits as its factorization.

66850439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 66850439 is about 8176.2117756330. The cubic root of 66850439 is about 405.8523713628.

The spelling of 66850439 in words is "sixty-six million, eight hundred fifty thousand, four hundred thirty-nine".