66207406871 has 2 divisors, whose sum is σ = 66207406872. Its totient is φ = 66207406870.

The previous prime is 66207406849. The next prime is 66207406873. The reversal of 66207406871 is 17860470266.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66207406871 - 2²² = 66203212567 is a prime.

Together with 66207406873, 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 (66207406873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33103703435 + 33103703436.

It is an arithmetic number, because the mean of its divisors is an integer number (33103703436).

Almost surely, 2^66207406871 is an apocalyptic number.

66207406871 is a deficient number, since it is larger than the sum of its proper divisors (1).

66207406871 is an equidigital number, since it uses as much as digits as its factorization.

66207406871 is an evil number, because the sum of its binary digits is even.

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

The spelling of 66207406871 in words is "sixty-six billion, two hundred seven million, four hundred six thousand, eight hundred seventy-one".