161615652224 has 128 divisors (see below), whose sum is σ = 383095500480. Its totient is φ = 67151462400.

The previous prime is 161615652203. The next prime is 161615652229. The reversal of 161615652224 is 422256516161.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×161615652224² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161615652229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526424 + ... + 774824.

Almost surely, 2^161615652224 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 161615652224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191547750240).

161615652224 is an abundant number, since it is smaller than the sum of its proper divisors (221479848256).

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

161615652224 is a wasteful number, since it uses less digits than its factorization.

161615652224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248468 (or 248456 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The spelling of 161615652224 in words is "one hundred sixty-one billion, six hundred fifteen million, six hundred fifty-two thousand, two hundred twenty-four".