643159445 has 8 divisors (see below), whose sum is σ = 774083544. Its totient is φ = 512999424.

The previous prime is 643159411. The next prime is 643159459. The reversal of 643159445 is 544951346.

It can be written as a sum of positive squares in 4 ways, for example, as 109641841 + 533517604 = 10471^2 + 23098^2 .

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 643159445 - 2¹⁸ = 642897301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189164 + ... + 192533.

It is an arithmetic number, because the mean of its divisors is an integer number (96760443).

Almost surely, 2^643159445 is an apocalyptic number.

It is an amenable number.

643159445 is a deficient number, since it is larger than the sum of its proper divisors (130924099).

643159445 is a wasteful number, since it uses less digits than its factorization.

643159445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382039.

The product of its digits is 259200, while the sum is 41.

The square root of 643159445 is about 25360.5884198297. The cubic root of 643159445 is about 863.1896359310.

The spelling of 643159445 in words is "six hundred forty-three million, one hundred fifty-nine thousand, four hundred forty-five".