664858943 has 8 divisors (see below), whose sum is σ = 761597088. Its totient is φ = 568560384.

The previous prime is 664858921. The next prime is 664858951. The reversal of 664858943 is 349858466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664858943 - 2²² = 660664639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664858343) 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 7 ways as a sum of consecutive naturals, for example, 106646 + ... + 112707.

It is an arithmetic number, because the mean of its divisors is an integer number (95199636).

Almost surely, 2^664858943 is an apocalyptic number.

664858943 is a deficient number, since it is larger than the sum of its proper divisors (96738145).

664858943 is a wasteful number, since it uses less digits than its factorization.

664858943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219793.

The product of its digits is 4976640, while the sum is 53.

The square root of 664858943 is about 25784.8587934858. The cubic root of 664858943 is about 872.7901539331.

The spelling of 664858943 in words is "six hundred sixty-four million, eight hundred fifty-eight thousand, nine hundred forty-three".