643445161544346 has 32 divisors (see below), whose sum is σ = 1481312602129920. Its totient is φ = 182518874187696.

The previous prime is 643445161544327. The next prime is 643445161544399.

643445161544346 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 643445161544346.

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, 55108349896 + ... + 55108361571.

It is an arithmetic number, because the mean of its divisors is an integer number (46291018816560).

Almost surely, 2^{643445161544346} is an apocalyptic number.

643445161544346 is an abundant number, since it is smaller than the sum of its proper divisors (837867440585574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643445161544346 is a wasteful number, since it uses less digits than its factorization.

643445161544346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110216711618.

The product of its digits is 199065600, while the sum is 60.

The spelling of 643445161544346 in words is "six hundred forty-three trillion, four hundred forty-five billion, one hundred sixty-one million, five hundred forty-four thousand, three hundred forty-six".