643425535456 has 96 divisors (see below), whose sum is σ = 1403395217280. Its totient is φ = 287949888000.

The previous prime is 643425535433. The next prime is 643425535481. The reversal of 643425535456 is 654535524346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6313255 + ... + 6414361.

It is an arithmetic number, because the mean of its divisors is an integer number (14618700180).

Almost surely, 2^643425535456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643425535456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701697608640).

643425535456 is an abundant number, since it is smaller than the sum of its proper divisors (759969681824).

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

643425535456 is a wasteful number, since it uses less digits than its factorization.

643425535456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101408 (or 101400 counting only the distinct ones).

The product of its digits is 25920000, while the sum is 52.

The spelling of 643425535456 in words is "six hundred forty-three billion, four hundred twenty-five million, five hundred thirty-five thousand, four hundred fifty-six".