161506632 has 64 divisors (see below), whose sum is σ = 463478400. Its totient is φ = 45941760.

The previous prime is 161506627. The next prime is 161506633. The reversal of 161506632 is 236605161.

It is a self number, because there is not a number n which added to its sum of digits gives 161506632.

It is not an unprimeable number, because it can be changed into a prime (161506633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38494 + ... + 42482.

It is an arithmetic number, because the mean of its divisors is an integer number (7241850).

Almost surely, 2^161506632 is an apocalyptic number.

161506632 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 161506632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231739200).

161506632 is an abundant number, since it is smaller than the sum of its proper divisors (301971768).

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

161506632 is a wasteful number, since it uses less digits than its factorization.

161506632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246 (or 4242 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 161506632 is about 12708.5259570101. The cubic root of 161506632 is about 544.5822143951.

The spelling of 161506632 in words is "one hundred sixty-one million, five hundred six thousand, six hundred thirty-two".