66170802647 has 2 divisors, whose sum is σ = 66170802648. Its totient is φ = 66170802646.

The previous prime is 66170802641. The next prime is 66170802671. The reversal of 66170802647 is 74620807166.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66170802647 - 2⁸ = 66170802391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66170802641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33085401323 + 33085401324.

It is an arithmetic number, because the mean of its divisors is an integer number (33085401324).

Almost surely, 2^66170802647 is an apocalyptic number.

66170802647 is a deficient number, since it is larger than the sum of its proper divisors (1).

66170802647 is an equidigital number, since it uses as much as digits as its factorization.

66170802647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 66170802647 in words is "sixty-six billion, one hundred seventy million, eight hundred two thousand, six hundred forty-seven".