161641730424 has 128 divisors (see below), whose sum is σ = 434945952000. Its totient is φ = 49908731904.

The previous prime is 161641730323. The next prime is 161641730441. The reversal of 161641730424 is 424037146161.

It is a super-2 number, since 2×161641730424² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3649242 + ... + 3693270.

It is an arithmetic number, because the mean of its divisors is an integer number (3398015250).

Almost surely, 2^161641730424 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 161641730424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217472976000).

161641730424 is an abundant number, since it is smaller than the sum of its proper divisors (273304221576).

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

161641730424 is a wasteful number, since it uses less digits than its factorization.

161641730424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44237 (or 44233 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

Adding to 161641730424 its reverse (424037146161), we get a palindrome (585678876585).

The spelling of 161641730424 in words is "one hundred sixty-one billion, six hundred forty-one million, seven hundred thirty thousand, four hundred twenty-four".