161365632 has 128 divisors (see below), whose sum is σ = 478094400. Its totient is φ = 47923200.

The previous prime is 161365619. The next prime is 161365639. The reversal of 161365632 is 236563161.

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

It is a junction number, because it is equal to n+sod(n) for n = 161365593 and 161365602.

It is not an unprimeable number, because it can be changed into a prime (161365639) 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, 123382 + ... + 124682.

Almost surely, 2^161365632 is an apocalyptic number.

161365632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161365632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239047200).

161365632 is an abundant number, since it is smaller than the sum of its proper divisors (316728768).

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

161365632 is a wasteful number, since it uses less digits than its factorization.

161365632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354 (or 1342 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 161365632 is about 12702.9772888091. The cubic root of 161365632 is about 544.4236895354.

The spelling of 161365632 in words is "one hundred sixty-one million, three hundred sixty-five thousand, six hundred thirty-two".