643599053 has 4 divisors (see below), whose sum is σ = 660993660. Its totient is φ = 626204448.

The previous prime is 643599031. The next prime is 643599067. The reversal of 643599053 is 350995346.

643599053 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 356567689 + 287031364 = 18883^2 + 16942^2 .

It is a cyclic number.

It is not a de Polignac number, because 643599053 - 2⁸ = 643598797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643598995 and 643599013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643599083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8697248 + ... + 8697321.

It is an arithmetic number, because the mean of its divisors is an integer number (165248415).

Almost surely, 2^643599053 is an apocalyptic number.

It is an amenable number.

643599053 is a deficient number, since it is larger than the sum of its proper divisors (17394607).

643599053 is a wasteful number, since it uses less digits than its factorization.

643599053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17394606.

The product of its (nonzero) digits is 437400, while the sum is 44.

The square root of 643599053 is about 25369.2540883645. The cubic root of 643599053 is about 863.3862583232.

The spelling of 643599053 in words is "six hundred forty-three million, five hundred ninety-nine thousand, fifty-three".