169138783856 has 80 divisors (see below), whose sum is σ = 380637066240. Its totient is φ = 71311069440.

The previous prime is 169138783829. The next prime is 169138783897. The reversal of 169138783856 is 658387831961.

It is a junction number, because it is equal to n+sod(n) for n = 169138783792 and 169138783801.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2416391 + ... + 2485401.

It is an arithmetic number, because the mean of its divisors is an integer number (4757963328).

Almost surely, 2^169138783856 is an apocalyptic number.

169138783856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 169138783856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190318533120).

169138783856 is an abundant number, since it is smaller than the sum of its proper divisors (211498282384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

169138783856 is a wasteful number, since it uses less digits than its factorization.

169138783856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69382 (or 69376 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 65.

The spelling of 169138783856 in words is "one hundred sixty-nine billion, one hundred thirty-eight million, seven hundred eighty-three thousand, eight hundred fifty-six".