161554536 has 288 divisors, whose sum is σ = 554973120. Its totient is φ = 41932800.

The previous prime is 161554517. The next prime is 161554537. The reversal of 161554536 is 635455161.

161554536 is a `hidden beast` number, since 1 + 615 + 5 + 4 + 5 + 36 = 666.

161554536 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161554536.

It is not an unprimeable number, because it can be changed into a prime (161554537) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2275381 + ... + 2275451.

It is an arithmetic number, because the mean of its divisors is an integer number (1926990).

Almost surely, 2^161554536 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 161554536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277486560).

161554536 is an abundant number, since it is smaller than the sum of its proper divisors (393418584).

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

161554536 is a wasteful number, since it uses less digits than its factorization.

161554536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 117 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 161554536 is about 12710.4105362494. The cubic root of 161554536 is about 544.6360513743.

The spelling of 161554536 in words is "one hundred sixty-one million, five hundred fifty-four thousand, five hundred thirty-six".