664741171 has 4 divisors (see below), whose sum is σ = 680200312. Its totient is φ = 649282032.

The previous prime is 664741169. The next prime is 664741243. The reversal of 664741171 is 171147466.

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 664741171 - 2¹ = 664741169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664741171.

It is not an unprimeable number, because it can be changed into a prime (664741151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7729506 + ... + 7729591.

It is an arithmetic number, because the mean of its divisors is an integer number (170050078).

Almost surely, 2^664741171 is an apocalyptic number.

664741171 is a deficient number, since it is larger than the sum of its proper divisors (15459141).

664741171 is a wasteful number, since it uses less digits than its factorization.

664741171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15459140.

The product of its digits is 28224, while the sum is 37.

The square root of 664741171 is about 25782.5749489844. The cubic root of 664741171 is about 872.7386160277.

The spelling of 664741171 in words is "six hundred sixty-four million, seven hundred forty-one thousand, one hundred seventy-one".