664982271 has 16 divisors (see below), whose sum is σ = 1016939520. Its totient is φ = 429020280.

The previous prime is 664982243. The next prime is 664982299. The reversal of 664982271 is 172289466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664982243) and next prime (664982299).

It is not a de Polignac number, because 664982271 - 2⁶ = 664982207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664982221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396405 + ... + 398078.

It is an arithmetic number, because the mean of its divisors is an integer number (63558720).

Almost surely, 2^664982271 is an apocalyptic number.

664982271 is a deficient number, since it is larger than the sum of its proper divisors (351957249).

664982271 is a wasteful number, since it uses less digits than its factorization.

664982271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794523 (or 794517 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 664982271 is about 25787.2501635983. The cubic root of 664982271 is about 872.8441166623.

The spelling of 664982271 in words is "six hundred sixty-four million, nine hundred eighty-two thousand, two hundred seventy-one".