643556655346 has 16 divisors (see below), whose sum is σ = 1053105026688. Its totient is φ = 292522330800.

The previous prime is 643556655341. The next prime is 643556655419.

643556655346 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (643556655341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3586936 + ... + 3762076.

It is an arithmetic number, because the mean of its divisors is an integer number (65819064168).

Almost surely, 2^643556655346 is an apocalyptic number.

643556655346 is a deficient number, since it is larger than the sum of its proper divisors (409548371342).

643556655346 is a wasteful number, since it uses less digits than its factorization.

643556655346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342177.

The product of its digits is 116640000, while the sum is 58.

The spelling of 643556655346 in words is "six hundred forty-three billion, five hundred fifty-six million, six hundred fifty-five thousand, three hundred forty-six".