665225549 has 8 divisors (see below), whose sum is σ = 704940000. Its totient is φ = 625981392.

The previous prime is 665225503. The next prime is 665225563. The reversal of 665225549 is 945522566.

665225549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665225549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665225569) 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, 114659 + ... + 120320.

It is an arithmetic number, because the mean of its divisors is an integer number (88117500).

Almost surely, 2^665225549 is an apocalyptic number.

It is an amenable number.

665225549 is a deficient number, since it is larger than the sum of its proper divisors (39714451).

665225549 is a wasteful number, since it uses less digits than its factorization.

665225549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235147.

The product of its digits is 648000, while the sum is 44.

The square root of 665225549 is about 25791.9667532354. The cubic root of 665225549 is about 872.9505445029.

The spelling of 665225549 in words is "six hundred sixty-five million, two hundred twenty-five thousand, five hundred forty-nine".