643612382205 has 32 divisors (see below), whose sum is σ = 1109643131520. Its totient is φ = 316669758720.

The previous prime is 643612382183. The next prime is 643612382239. The reversal of 643612382205 is 502283216346.

It is a happy number.

It is not a de Polignac number, because 643612382205 - 2¹¹ = 643612380157 is a prime.

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 in 31 ways as a sum of consecutive naturals, for example, 632391 + ... + 1298900.

It is an arithmetic number, because the mean of its divisors is an integer number (34676347860).

Almost surely, 2^643612382205 is an apocalyptic number.

643612382205 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

643612382205 is a deficient number, since it is larger than the sum of its proper divisors (466030749315).

643612382205 is a wasteful number, since it uses less digits than its factorization.

643612382205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933021.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 643612382205 in words is "six hundred forty-three billion, six hundred twelve million, three hundred eighty-two thousand, two hundred five".