169821973043776 has 21 divisors (see below), whose sum is σ = 336990684635139. Its totient is φ = 84910934395584.

The previous prime is 169821973043773. The next prime is 169821973043777. The reversal of 169821973043776 is 677340379128961.

The square root of 169821973043776 is 13031576.

It is a perfect power (a square), and thus also a powerful number.

169821973043776 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 169821973043699 and 169821973043708.

It is not an unprimeable number, because it can be changed into a prime (169821973043773) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 103438135 + ... + 105067081.

Almost surely, 2^{169821973043776} is an apocalyptic number.

169821973043776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

169821973043776 is the 13031576-th square number.

It is an amenable number.

169821973043776 is a deficient number, since it is larger than the sum of its proper divisors (167168711591363).

169821973043776 is an frugal number, since it uses more digits than its factorization.

169821973043776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257906 (or 1628949 counting only the distinct ones).

The product of its (nonzero) digits is 576108288, while the sum is 73.

The spelling of 169821973043776 in words is "one hundred sixty-nine trillion, eight hundred twenty-one billion, nine hundred seventy-three million, forty-three thousand, seven hundred seventy-six".