16641643123 has 16 divisors (see below), whose sum is σ = 19879856640. Its totient is φ = 13620758976.

The previous prime is 16641643121. The next prime is 16641643129. The reversal of 16641643123 is 32134614661.

It is not a de Polignac number, because 16641643123 - 2¹ = 16641643121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16641643121) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6463 + ... + 182551.

It is an arithmetic number, because the mean of its divisors is an integer number (1242491040).

Almost surely, 2^16641643123 is an apocalyptic number.

16641643123 is a deficient number, since it is larger than the sum of its proper divisors (3238213517).

16641643123 is a wasteful number, since it uses less digits than its factorization.

16641643123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176706.

The product of its digits is 62208, while the sum is 37.

The spelling of 16641643123 in words is "sixteen billion, six hundred forty-one million, six hundred forty-three thousand, one hundred twenty-three".