643616115434 has 16 divisors (see below), whose sum is σ = 990037612608. Its totient is φ = 313636331232.

The previous prime is 643616115431. The next prime is 643616115463. The reversal of 643616115434 is 434511616346.

It is not an unprimeable number, because it can be changed into a prime (643616115431) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8148782 + ... + 8227385.

It is an arithmetic number, because the mean of its divisors is an integer number (61877350788).

Almost surely, 2^643616115434 is an apocalyptic number.

643616115434 is a deficient number, since it is larger than the sum of its proper divisors (346421497174).

643616115434 is a wasteful number, since it uses less digits than its factorization.

643616115434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16376669.

The product of its digits is 622080, while the sum is 44.

The spelling of 643616115434 in words is "six hundred forty-three billion, six hundred sixteen million, one hundred fifteen thousand, four hundred thirty-four".