66117271167 has 20 divisors (see below), whose sum is σ = 98871529680. Its totient is φ = 44031877344.

The previous prime is 66117271123. The next prime is 66117271183. The reversal of 66117271167 is 76117271166.

It is a happy number.

66117271167 is a `hidden beast` number, since 6 + 611 + 7 + 27 + 1 + 1 + 6 + 7 = 666.

It is not a de Polignac number, because 66117271167 - 2⁸ = 66117270911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66117271967) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 351067 + ... + 505452.

It is an arithmetic number, because the mean of its divisors is an integer number (4943576484).

Almost surely, 2^66117271167 is an apocalyptic number.

66117271167 is a deficient number, since it is larger than the sum of its proper divisors (32754258513).

66117271167 is an equidigital number, since it uses as much as digits as its factorization.

66117271167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857484 (or 857475 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

Subtracting 66117271167 from its reverse (76117271166), we obtain a palindrome (9999999999).

The spelling of 66117271167 in words is "sixty-six billion, one hundred seventeen million, two hundred seventy-one thousand, one hundred sixty-seven".