66664171255 has 16 divisors (see below), whose sum is σ = 87303484800. Its totient is φ = 48464131360.

The previous prime is 66664171241. The next prime is 66664171279. The reversal of 66664171255 is 55217146666.

It is not a de Polignac number, because 66664171255 - 2⁹ = 66664170743 is a prime.

It is a super-2 number, since 2×66664171255² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66664171199 and 66664171208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93145 + ... + 376834.

It is an arithmetic number, because the mean of its divisors is an integer number (5456467800).

Almost surely, 2^66664171255 is an apocalyptic number.

66664171255 is a deficient number, since it is larger than the sum of its proper divisors (20639313545).

66664171255 is a wasteful number, since it uses less digits than its factorization.

66664171255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472574.

The product of its digits is 1814400, while the sum is 49.

The spelling of 66664171255 in words is "sixty-six billion, six hundred sixty-four million, one hundred seventy-one thousand, two hundred fifty-five".