643326623346 has 64 divisors (see below), whose sum is σ = 1413580844160. Its totient is φ = 193567203840.

The previous prime is 643326623339. The next prime is 643326623377.

643326623346 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643326623295 and 643326623304.

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 31 ways as a sum of consecutive naturals, for example, 8789670 + ... + 8862558.

It is an arithmetic number, because the mean of its divisors is an integer number (22087200690).

Almost surely, 2^643326623346 is an apocalyptic number.

643326623346 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

643326623346 is an abundant number, since it is smaller than the sum of its proper divisors (770254220814).

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

643326623346 is a wasteful number, since it uses less digits than its factorization.

643326623346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73851.

The product of its digits is 6718464, while the sum is 48.

The spelling of 643326623346 in words is "six hundred forty-three billion, three hundred twenty-six million, six hundred twenty-three thousand, three hundred forty-six".