643306660096 has 27 divisors (see below), whose sum is σ = 1284126019981. Its totient is φ = 321646913536.

The previous prime is 643306660039. The next prime is 643306660103. The reversal of 643306660096 is 690066603346.

The square root of 643306660096 is 802064.

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., 622937661696 + 20368998400 = 789264^2 + 142720^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12807960 + ... + 12858088.

Almost surely, 2^643306660096 is an apocalyptic number.

643306660096 is the 802064-th square number.

It is an amenable number.

643306660096 is a deficient number, since it is larger than the sum of its proper divisors (640819359885).

643306660096 is an frugal number, since it uses more digits than its factorization.

643306660096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100274 (or 50131 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 49.

Multiplying 643306660096 by its sum of digits (49), we get a square (31522026344704 = 5614448²).

The spelling of 643306660096 in words is "six hundred forty-three billion, three hundred six million, six hundred sixty thousand, ninety-six".