643123349236 has 24 divisors (see below), whose sum is σ = 1136510333504. Its totient is φ = 318406757760.

The previous prime is 643123349171. The next prime is 643123349257. The reversal of 643123349236 is 632943321346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4176631 + ... + 4327873.

Almost surely, 2^643123349236 is an apocalyptic number.

It is an amenable number.

643123349236 is a deficient number, since it is larger than the sum of its proper divisors (493386984268).

643123349236 is a wasteful number, since it uses less digits than its factorization.

643123349236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161671 (or 161669 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 46.

The spelling of 643123349236 in words is "six hundred forty-three billion, one hundred twenty-three million, three hundred forty-nine thousand, two hundred thirty-six".