165221604342 has 48 divisors (see below), whose sum is σ = 368255955600. Its totient is φ = 53497838016.

The previous prime is 165221604341. The next prime is 165221604349. The reversal of 165221604342 is 243406122561.

165221604342 is a `hidden beast` number, since 1 + 6 + 5 + 2 + 2 + 1 + 604 + 3 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 165221604297 and 165221604306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165221604341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 205909 + ... + 610607.

It is an arithmetic number, because the mean of its divisors is an integer number (7671999075).

Almost surely, 2^165221604342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165221604342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184127977800).

165221604342 is an abundant number, since it is smaller than the sum of its proper divisors (203034351258).

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

165221604342 is a wasteful number, since it uses less digits than its factorization.

165221604342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405357 (or 405354 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 165221604342 in words is "one hundred sixty-five billion, two hundred twenty-one million, six hundred four thousand, three hundred forty-two".