643123350344663 has 16 divisors (see below), whose sum is σ = 664390583614080. Its totient is φ = 622295085424896.

The previous prime is 643123350344633. The next prime is 643123350344693. The reversal of 643123350344663 is 366443053321346.

643123350344663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643123350344633) and next prime (643123350344693).

It is a cyclic number.

It is not a de Polignac number, because 643123350344663 - 2³² = 643119055377367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643123350344603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354246920 + ... + 356057757.

It is an arithmetic number, because the mean of its divisors is an integer number (41524411475880).

Almost surely, 2^{643123350344663} is an apocalyptic number.

643123350344663 is a deficient number, since it is larger than the sum of its proper divisors (21267233269417).

643123350344663 is a wasteful number, since it uses less digits than its factorization.

643123350344663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710304986.

The product of its (nonzero) digits is 33592320, while the sum is 53.

The spelling of 643123350344663 in words is "six hundred forty-three trillion, one hundred twenty-three billion, three hundred fifty million, three hundred forty-four thousand, six hundred sixty-three".