6643301167645 has 4 divisors (see below), whose sum is σ = 7971961401180. Its totient is φ = 5314640934112.

The previous prime is 6643301167571. The next prime is 6643301167649. The reversal of 6643301167645 is 5467611033466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 991741123044 + 5651560044601 = 995862^2 + 2377301^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643301167645 - 2¹⁷ = 6643301036573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6643301167592 and 6643301167601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643301167649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664330116760 + ... + 664330116769.

It is an arithmetic number, because the mean of its divisors is an integer number (1992990350295).

Almost surely, 2^{6643301167645} is an apocalyptic number.

It is an amenable number.

6643301167645 is a deficient number, since it is larger than the sum of its proper divisors (1328660233535).

6643301167645 is a wasteful number, since it uses less digits than its factorization.

6643301167645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328660233534.

The product of its (nonzero) digits is 6531840, while the sum is 52.

The spelling of 6643301167645 in words is "six trillion, six hundred forty-three billion, three hundred one million, one hundred sixty-seven thousand, six hundred forty-five".