643903534096 has 15 divisors (see below), whose sum is σ = 1247569316221. Its totient is φ = 321950162176.

The previous prime is 643903534037. The next prime is 643903534097. The reversal of 643903534096 is 690435309346.

The square root of 643903534096 is 802436.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3391431696 + 640512102400 = 58236^2 + 800320^2 .

It is a super-2 number, since 2×643903534096² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643903534097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3109440 + ... + 3310048.

Almost surely, 2^643903534096 is an apocalyptic number.

643903534096 is the 802436-th square number.

It is an amenable number.

643903534096 is a deficient number, since it is larger than the sum of its proper divisors (603665782125).

643903534096 is an frugal number, since it uses more digits than its factorization.

643903534096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401226 (or 200611 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 52.

The spelling of 643903534096 in words is "six hundred forty-three billion, nine hundred three million, five hundred thirty-four thousand, ninety-six".