643663063730 has 8 divisors (see below), whose sum is σ = 1158593514732. Its totient is φ = 257465225488.

The previous prime is 643663063723. The next prime is 643663063793. The reversal of 643663063730 is 37360366346.

It can be written as a sum of positive squares in 2 ways, for example, as 596340717361 + 47322346369 = 772231^2 + 217537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×643663063730² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32183153177 + ... + 32183153196.

Almost surely, 2^643663063730 is an apocalyptic number.

643663063730 is a deficient number, since it is larger than the sum of its proper divisors (514930451002).

643663063730 is a wasteful number, since it uses less digits than its factorization.

643663063730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64366306380.

The product of its (nonzero) digits is 2939328, while the sum is 47.

The spelling of 643663063730 in words is "six hundred forty-three billion, six hundred sixty-three million, sixty-three thousand, seven hundred thirty".