165669890128 has 20 divisors (see below), whose sum is σ = 332053875540. Its totient is φ = 79978567424.

The previous prime is 165669890117. The next prime is 165669890209. The reversal of 165669890128 is 821098966561.

It can be written as a sum of positive squares in 2 ways, for example, as 136417945104 + 29251945024 = 369348^2 + 171032^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178523125 + ... + 178524052.

It is an arithmetic number, because the mean of its divisors is an integer number (16602693777).

Almost surely, 2^165669890128 is an apocalyptic number.

It is an amenable number.

165669890128 is an abundant number, since it is smaller than the sum of its proper divisors (166383985412).

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

165669890128 is a wasteful number, since it uses less digits than its factorization.

165669890128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357047214 (or 357047208 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 61.

The spelling of 165669890128 in words is "one hundred sixty-five billion, six hundred sixty-nine million, eight hundred ninety thousand, one hundred twenty-eight".