643123352140546 has 16 divisors (see below), whose sum is σ = 970867119598200. Its totient is φ = 319507388575488.

The previous prime is 643123352140541. The next prime is 643123352140613. The reversal of 643123352140546 is 645041253321346.

643123352140546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 439568501560321 + 203554850580225 = 20965889^2 + 14267265^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 643123352140546.

It is not an unprimeable number, because it can be changed into a prime (643123352140541) 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, 1602207591 + ... + 1602608938.

Almost surely, 2^{643123352140546} is an apocalyptic number.

643123352140546 is a deficient number, since it is larger than the sum of its proper divisors (327743767457654).

643123352140546 is a wasteful number, since it uses less digits than its factorization.

643123352140546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3204817173.

The product of its (nonzero) digits is 6220800, while the sum is 49.

The spelling of 643123352140546 in words is "six hundred forty-three trillion, one hundred twenty-three billion, three hundred fifty-two million, one hundred forty thousand, five hundred forty-six".