643324245240 has 128 divisors (see below), whose sum is σ = 1936174363200. Its totient is φ = 171002388480.

The previous prime is 643324245199. The next prime is 643324245251. The reversal of 643324245240 is 42542423346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151689520 + ... + 151693760.

Almost surely, 2^643324245240 is an apocalyptic number.

643324245240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643324245240 is an abundant number, since it is smaller than the sum of its proper divisors (1292850117960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643324245240 is a wasteful number, since it uses less digits than its factorization.

643324245240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8017 (or 8013 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 39.

Adding to 643324245240 its reverse (42542423346), we get a palindrome (685866668586).

The spelling of 643324245240 in words is "six hundred forty-three billion, three hundred twenty-four million, two hundred forty-five thousand, two hundred forty".