643420730743 has 8 divisors (see below), whose sum is σ = 778593153312. Its totient is φ = 519062102016.

The previous prime is 643420730737. The next prime is 643420730759. The reversal of 643420730743 is 347037024346.

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

It is a cyclic number.

It is not a de Polignac number, because 643420730743 - 2¹³ = 643420722551 is a prime.

It is a super-2 number, since 2×643420730743² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643420730743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643420730783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2703448330 + ... + 2703448567.

It is an arithmetic number, because the mean of its divisors is an integer number (97324144164).

Almost surely, 2^643420730743 is an apocalyptic number.

643420730743 is a deficient number, since it is larger than the sum of its proper divisors (135172422569).

643420730743 is a wasteful number, since it uses less digits than its factorization.

643420730743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5406896921.

The product of its (nonzero) digits is 1016064, while the sum is 43.

The spelling of 643420730743 in words is "six hundred forty-three billion, four hundred twenty million, seven hundred thirty thousand, seven hundred forty-three".