66403861871 has 2 divisors, whose sum is σ = 66403861872. Its totient is φ = 66403861870.

The previous prime is 66403861847. The next prime is 66403861873. The reversal of 66403861871 is 17816830466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66403861871 - 2⁶ = 66403861807 is a prime.

Together with 66403861873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66403861873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33201930935 + 33201930936.

It is an arithmetic number, because the mean of its divisors is an integer number (33201930936).

Almost surely, 2^66403861871 is an apocalyptic number.

66403861871 is a deficient number, since it is larger than the sum of its proper divisors (1).

66403861871 is an equidigital number, since it uses as much as digits as its factorization.

66403861871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 66403861871 in words is "sixty-six billion, four hundred three million, eight hundred sixty-one thousand, eight hundred seventy-one".