161956524 has 72 divisors (see below), whose sum is σ = 408282112. Its totient is φ = 49911840.

The previous prime is 161956523. The next prime is 161956567. The reversal of 161956524 is 425659161.

It is not an unprimeable number, because it can be changed into a prime (161956523) 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 23 ways as a sum of consecutive naturals, for example, 196377 + ... + 197199.

Almost surely, 2^161956524 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 161956524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204141056).

161956524 is an abundant number, since it is smaller than the sum of its proper divisors (246325588).

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

161956524 is a wasteful number, since it uses less digits than its factorization.

161956524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 882 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 161956524 is about 12726.2140481763. The cubic root of 161956524 is about 545.0874073539.

The spelling of 161956524 in words is "one hundred sixty-one million, nine hundred fifty-six thousand, five hundred twenty-four".