66896671 has 2 divisors, whose sum is σ = 66896672. Its totient is φ = 66896670.

The previous prime is 66896657. The next prime is 66896699. The reversal of 66896671 is 17669866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66896671 - 2⁵ = 66896639 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66896371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33448335 + 33448336.

It is an arithmetic number, because the mean of its divisors is an integer number (33448336).

Almost surely, 2^66896671 is an apocalyptic number.

66896671 is a deficient number, since it is larger than the sum of its proper divisors (1).

66896671 is an equidigital number, since it uses as much as digits as its factorization.

66896671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 66896671 is about 8179.0385131750. The cubic root of 66896671 is about 405.9459087344.

The spelling of 66896671 in words is "sixty-six million, eight hundred ninety-six thousand, six hundred seventy-one".