16166643843 has 18 divisors (see below), whose sum is σ = 25077185796. Its totient is φ = 9237201288.

The previous prime is 16166643841. The next prime is 16166643847. The reversal of 16166643843 is 34834666161.

16166643843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16166643843 - 2¹ = 16166643841 is a prime.

It is a super-2 number, since 2×16166643843² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16166643792 and 16166643801.

It is not an unprimeable number, because it can be changed into a prime (16166643841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1536346 + ... + 1546832.

Almost surely, 2^16166643843 is an apocalyptic number.

16166643843 is a deficient number, since it is larger than the sum of its proper divisors (8910541953).

16166643843 is an frugal number, since it uses more digits than its factorization.

16166643843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20991 (or 10497 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 48.

Multiplying 16166643843 by its sum of digits (48), we get a square (775998904464 = 880908²).

The spelling of 16166643843 in words is "sixteen billion, one hundred sixty-six million, six hundred forty-three thousand, eight hundred forty-three".