66170755439 has 2 divisors, whose sum is σ = 66170755440. Its totient is φ = 66170755438.

The previous prime is 66170755381. The next prime is 66170755451. The reversal of 66170755439 is 93455707166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66170755439 - 2¹² = 66170751343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66170755499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33085377719 + 33085377720.

It is an arithmetic number, because the mean of its divisors is an integer number (33085377720).

Almost surely, 2^66170755439 is an apocalyptic number.

66170755439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66170755439 is an equidigital number, since it uses as much as digits as its factorization.

66170755439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4762800, while the sum is 53.

The spelling of 66170755439 in words is "sixty-six billion, one hundred seventy million, seven hundred fifty-five thousand, four hundred thirty-nine".