643105144430 has 64 divisors (see below), whose sum is σ = 1331821440000. Its totient is φ = 219018878208.

The previous prime is 643105144399. The next prime is 643105144447. The reversal of 643105144430 is 34441501346.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 11487146 + ... + 11542994.

It is an arithmetic number, because the mean of its divisors is an integer number (20809710000).

Almost surely, 2^643105144430 is an apocalyptic number.

643105144430 is an abundant number, since it is smaller than the sum of its proper divisors (688716295570).

643105144430 is a wasteful number, since it uses less digits than its factorization.

643105144430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56961.

The product of its (nonzero) digits is 69120, while the sum is 35.

Adding to 643105144430 its reverse (34441501346), we get a palindrome (677546645776).

The spelling of 643105144430 in words is "six hundred forty-three billion, one hundred five million, one hundred forty-four thousand, four hundred thirty".