643475549 has 8 divisors (see below), whose sum is σ = 649192320. Its totient is φ = 637781296.

The previous prime is 643475533. The next prime is 643475563. The reversal of 643475549 is 945574346.

643475549 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 not a de Polignac number, because 643475549 - 2⁴ = 643475533 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 (643475579) 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, 54587 + ... + 65319.

It is an arithmetic number, because the mean of its divisors is an integer number (81149040).

Almost surely, 2^643475549 is an apocalyptic number.

It is an amenable number.

643475549 is a deficient number, since it is larger than the sum of its proper divisors (5716771).

643475549 is a wasteful number, since it uses less digits than its factorization.

643475549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11259.

The product of its digits is 1814400, while the sum is 47.

The square root of 643475549 is about 25366.8198440404. The cubic root of 643475549 is about 863.3310280379.

It can be divided in two parts, 64347 and 5549, that added together give a palindrome (69896).

The spelling of 643475549 in words is "six hundred forty-three million, four hundred seventy-five thousand, five hundred forty-nine".