664056271 has 4 divisors (see below), whose sum is σ = 664218544. Its totient is φ = 663894000.

The previous prime is 664056259. The next prime is 664056293. The reversal of 664056271 is 172650466.

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 664056271 - 2⁷ = 664056143 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 664056271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664156271) 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, 74835 + ... + 83236.

It is an arithmetic number, because the mean of its divisors is an integer number (166054636).

Almost surely, 2^664056271 is an apocalyptic number.

664056271 is a deficient number, since it is larger than the sum of its proper divisors (162273).

664056271 is a wasteful number, since it uses less digits than its factorization.

664056271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162272.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 664056271 is about 25769.2892994743. The cubic root of 664056271 is about 872.4387779803.

The spelling of 664056271 in words is "six hundred sixty-four million, fifty-six thousand, two hundred seventy-one".