169220021768 has 108 divisors (see below), whose sum is σ = 375247524015. Its totient is φ = 71332593696.

The previous prime is 169220021753. The next prime is 169220021783. The reversal of 169220021768 is 867120022961.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

169220021768 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (169220021753) and next prime (169220021783).

It can be written as a sum of positive squares in only one way, i.e., 84610010884 + 84610010884 = 290878^2 + 290878^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=290878.

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 26 ways as a sum of consecutive naturals, for example, 643422005 + ... + 643422267.

Almost surely, 2^169220021768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 169220021768

169220021768 is an abundant number, since it is smaller than the sum of its proper divisors (206027502247).

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

169220021768 is an frugal number, since it uses more digits than its factorization.

169220021768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 169220021768 in words is "one hundred sixty-nine billion, two hundred twenty million, twenty-one thousand, seven hundred sixty-eight".