643949045223 has 32 divisors (see below), whose sum is σ = 964586188800. Its totient is φ = 378800853600.

The previous prime is 643949045177. The next prime is 643949045237. The reversal of 643949045223 is 322540949346.

It is not a de Polignac number, because 643949045223 - 2¹³ = 643949037031 is a prime.

It is a super-2 number, since 2×643949045223² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643949044223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1939473 + ... + 2247098.

It is an arithmetic number, because the mean of its divisors is an integer number (30143318400).

Almost surely, 2^643949045223 is an apocalyptic number.

643949045223 is a deficient number, since it is larger than the sum of its proper divisors (320637143577).

643949045223 is a wasteful number, since it uses less digits than its factorization.

643949045223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186723.

The product of its (nonzero) digits is 5598720, while the sum is 51.

The spelling of 643949045223 in words is "six hundred forty-three billion, nine hundred forty-nine million, forty-five thousand, two hundred twenty-three".