643453453 has 16 divisors (see below), whose sum is σ = 680601600. Its totient is φ = 607420800.

The previous prime is 643453427. The next prime is 643453471. The reversal of 643453453 is 354354346.

It is a cyclic number.

It is not a de Polignac number, because 643453453 - 2¹³ = 643445261 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 (643453423) 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 15 ways as a sum of consecutive naturals, for example, 612873 + ... + 613921.

It is an arithmetic number, because the mean of its divisors is an integer number (42537600).

Almost surely, 2^643453453 is an apocalyptic number.

It is an amenable number.

643453453 is a deficient number, since it is larger than the sum of its proper divisors (37148147).

643453453 is a wasteful number, since it uses less digits than its factorization.

643453453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548.

The product of its digits is 259200, while the sum is 37.

The square root of 643453453 is about 25366.3843107369. The cubic root of 643453453 is about 863.3211460873.

The spelling of 643453453 in words is "six hundred forty-three million, four hundred fifty-three thousand, four hundred fifty-three".