161225152236 has 144 divisors (see below), whose sum is σ = 422555253120. Its totient is φ = 51802329600.

The previous prime is 161225152201. The next prime is 161225152259. The reversal of 161225152236 is 632251522161.

161225152236 is a `hidden beast` number, since 1 + 6 + 122 + 5 + 1 + 522 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161225152236.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33663330 + ... + 33668118.

It is an arithmetic number, because the mean of its divisors is an integer number (2934411480).

Almost surely, 2^161225152236 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 161225152236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211277626560).

161225152236 is an abundant number, since it is smaller than the sum of its proper divisors (261330100884).

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

161225152236 is a wasteful number, since it uses less digits than its factorization.

161225152236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144 (or 5139 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

Adding to 161225152236 its reverse (632251522161), we get a palindrome (793476674397).

The spelling of 161225152236 in words is "one hundred sixty-one billion, two hundred twenty-five million, one hundred fifty-two thousand, two hundred thirty-six".