664822549 has 8 divisors (see below), whose sum is σ = 683119008. Its totient is φ = 646543440.

The previous prime is 664822517. The next prime is 664822573. The reversal of 664822549 is 945228466.

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

It is a cyclic number.

It is not a de Polignac number, because 664822549 - 2⁵ = 664822517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664822499 and 664822508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664822579) 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 7 ways as a sum of consecutive naturals, for example, 126594 + ... + 131740.

It is an arithmetic number, because the mean of its divisors is an integer number (85389876).

Almost surely, 2^664822549 is an apocalyptic number.

It is an amenable number.

664822549 is a deficient number, since it is larger than the sum of its proper divisors (18296459).

664822549 is a wasteful number, since it uses less digits than its factorization.

664822549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8675.

The product of its digits is 829440, while the sum is 46.

The square root of 664822549 is about 25784.1530595829. The cubic root of 664822549 is about 872.7742282971.

The spelling of 664822549 in words is "six hundred sixty-four million, eight hundred twenty-two thousand, five hundred forty-nine".