643224959854 has 4 divisors (see below), whose sum is σ = 964837439784. Its totient is φ = 321612479926.

The previous prime is 643224959809. The next prime is 643224959873. The reversal of 643224959854 is 458959422346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 458959422346 = 2 ⋅229479711173.

It is a junction number, because it is equal to n+sod(n) for n = 643224959792 and 643224959801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160806239962 + ... + 160806239965.

It is an arithmetic number, because the mean of its divisors is an integer number (241209359946).

Almost surely, 2^643224959854 is an apocalyptic number.

643224959854 is a deficient number, since it is larger than the sum of its proper divisors (321612479930).

643224959854 is a wasteful number, since it uses less digits than its factorization.

643224959854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321612479929.

The product of its digits is 74649600, while the sum is 61.

The spelling of 643224959854 in words is "six hundred forty-three billion, two hundred twenty-four million, nine hundred fifty-nine thousand, eight hundred fifty-four".