643440325042 has 8 divisors (see below), whose sum is σ = 965567563632. Its totient is φ = 321584470500.

The previous prime is 643440325009. The next prime is 643440325049. The reversal of 643440325042 is 240523044346.

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

It is a super-2 number, since 2×643440325042² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643440324992 and 643440325010.

It is not an unprimeable number, because it can be changed into a prime (643440325049) 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, 67840084 + ... + 67849567.

It is an arithmetic number, because the mean of its divisors is an integer number (120695945454).

Almost surely, 2^643440325042 is an apocalyptic number.

643440325042 is a deficient number, since it is larger than the sum of its proper divisors (322127238590).

643440325042 is a wasteful number, since it uses less digits than its factorization.

643440325042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135692024.

The product of its (nonzero) digits is 276480, while the sum is 37.

Adding to 643440325042 its reverse (240523044346), we get a palindrome (883963369388).

The spelling of 643440325042 in words is "six hundred forty-three billion, four hundred forty million, three hundred twenty-five thousand, forty-two".