1643119664668 has 6 divisors (see below), whose sum is σ = 2875459413176. Its totient is φ = 821559832332.

The previous prime is 1643119664653. The next prime is 1643119664687. The reversal of 1643119664668 is 8664669113461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205389958080 + ... + 205389958087.

Almost surely, 2^{1643119664668} is an apocalyptic number.

It is an amenable number.

1643119664668 is a deficient number, since it is larger than the sum of its proper divisors (1232339748508).

1643119664668 is a wasteful number, since it uses less digits than its factorization.

1643119664668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410779916171 (or 410779916169 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 61.

The spelling of 1643119664668 in words is "one trillion, six hundred forty-three billion, one hundred nineteen million, six hundred sixty-four thousand, six hundred sixty-eight".