643105254406 has 16 divisors (see below), whose sum is σ = 965814318000. Its totient is φ = 321167282688.

The previous prime is 643105254343. The next prime is 643105254443. The reversal of 643105254406 is 604452501346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10529745 + ... + 10590643.

It is an arithmetic number, because the mean of its divisors is an integer number (60363394875).

Almost surely, 2^643105254406 is an apocalyptic number.

643105254406 is a deficient number, since it is larger than the sum of its proper divisors (322709063594).

643105254406 is a wasteful number, since it uses less digits than its factorization.

643105254406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67143.

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 643105254406 in words is "six hundred forty-three billion, one hundred five million, two hundred fifty-four thousand, four hundred six".