643858858346 has 32 divisors (see below), whose sum is σ = 1134830822400. Its totient is φ = 270811885680.

The previous prime is 643858858219. The next prime is 643858858351.

643858858346 is nontrivially palindromic in base 10.

643858858346 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×643858858346² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17892866 + ... + 17928813.

It is an arithmetic number, because the mean of its divisors is an integer number (35463463200).

Almost surely, 2^643858858346 is an apocalyptic number.

643858858346 is a deficient number, since it is larger than the sum of its proper divisors (490971964054).

643858858346 is a wasteful number, since it uses less digits than its factorization.

643858858346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35821754.

The product of its digits is 530841600, while the sum is 68.

The spelling of 643858858346 in words is "six hundred forty-three billion, eight hundred fifty-eight million, eight hundred fifty-eight thousand, three hundred forty-six".