664486549 has 8 divisors (see below), whose sum is σ = 688345560. Its totient is φ = 640992000.

The previous prime is 664486513. The next prime is 664486561. The reversal of 664486549 is 945684466.

It is a happy number.

664486549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 50339025 + 614147524 = 7095^2 + 24782^2 .

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 664486549 - 2⁷ = 664486421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664486496 and 664486505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664486649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87402 + ... + 94699.

It is an arithmetic number, because the mean of its divisors is an integer number (86043195).

Almost surely, 2^664486549 is an apocalyptic number.

It is an amenable number.

664486549 is a deficient number, since it is larger than the sum of its proper divisors (23859011).

664486549 is a wasteful number, since it uses less digits than its factorization.

664486549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182231.

The product of its digits is 4976640, while the sum is 52.

The square root of 664486549 is about 25777.6366061747. The cubic root of 664486549 is about 872.6271707311.

The spelling of 664486549 in words is "six hundred sixty-four million, four hundred eighty-six thousand, five hundred forty-nine".