64728668171 has 4 divisors (see below), whose sum is σ = 68135440200. Its totient is φ = 61321896144.

The previous prime is 64728668161. The next prime is 64728668197. The reversal of 64728668171 is 17186682746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64728668171 - 2¹⁸ = 64728406027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64728668161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703385986 + ... + 1703386023.

It is an arithmetic number, because the mean of its divisors is an integer number (17033860050).

Almost surely, 2^64728668171 is an apocalyptic number.

64728668171 is a deficient number, since it is larger than the sum of its proper divisors (3406772029).

64728668171 is a wasteful number, since it uses less digits than its factorization.

64728668171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3406772028.

The product of its digits is 5419008, while the sum is 56.

The spelling of 64728668171 in words is "sixty-four billion, seven hundred twenty-eight million, six hundred sixty-eight thousand, one hundred seventy-one".