643421133326654 has 16 divisors (see below), whose sum is σ = 981681977713536. Its totient is φ = 316221185880600.

The previous prime is 643421133326639. The next prime is 643421133326659. The reversal of 643421133326654 is 456623331124346.

It is a super-3 number, since 3×643421133326654³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 643421133326596 and 643421133326605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643421133326659) 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, 6844567412 + ... + 6844661415.

It is an arithmetic number, because the mean of its divisors is an integer number (61355123607096).

Almost surely, 2^{643421133326654} is an apocalyptic number.

643421133326654 is a deficient number, since it is larger than the sum of its proper divisors (338260844386882).

643421133326654 is a wasteful number, since it uses less digits than its factorization.

643421133326654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13689229231.

The product of its digits is 22394880, while the sum is 53.

The spelling of 643421133326654 in words is "six hundred forty-three trillion, four hundred twenty-one billion, one hundred thirty-three million, three hundred twenty-six thousand, six hundred fifty-four".