16643708478629 has 2 divisors, whose sum is σ = 16643708478630. Its totient is φ = 16643708478628.

The previous prime is 16643708478623. The next prime is 16643708478673. The reversal of 16643708478629 is 92687480734661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13458090349729 + 3185618128900 = 3668527^2 + 1784830^2 .

It is a cyclic number.

It is not a de Polignac number, because 16643708478629 - 2³² = 16639413511333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16643708478623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321854239314 + 8321854239315.

It is an arithmetic number, because the mean of its divisors is an integer number (8321854239315).

Almost surely, 2^{16643708478629} is an apocalyptic number.

It is an amenable number.

16643708478629 is a deficient number, since it is larger than the sum of its proper divisors (1).

16643708478629 is an equidigital number, since it uses as much as digits as its factorization.

16643708478629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 585252864, while the sum is 71.

The spelling of 16643708478629 in words is "sixteen trillion, six hundred forty-three billion, seven hundred eight million, four hundred seventy-eight thousand, six hundred twenty-nine".