165563388042 has 96 divisors (see below), whose sum is σ = 380512339200. Its totient is φ = 47836938240.

The previous prime is 165563388037. The next prime is 165563388049. The reversal of 165563388042 is 240883365561.

It is a super-2 number, since 2×165563388042² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (165563388049) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7729167 + ... + 7750557.

It is an arithmetic number, because the mean of its divisors is an integer number (3963670200).

Almost surely, 2^165563388042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165563388042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190256169600).

165563388042 is an abundant number, since it is smaller than the sum of its proper divisors (214948951158).

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

165563388042 is a wasteful number, since it uses less digits than its factorization.

165563388042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21888 (or 21875 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 165563388042 in words is "one hundred sixty-five billion, five hundred sixty-three million, three hundred eighty-eight thousand, forty-two".