161716356 has 72 divisors (see below), whose sum is σ = 420323904. Its totient is φ = 52403520.

The previous prime is 161716351. The next prime is 161716361. The reversal of 161716356 is 653617161.

161716356 is a `hidden beast` number, since 1 + 6 + 17 + 1 + 635 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (161716351) and next prime (161716361).

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 161716356.

It is not an unprimeable number, because it can be changed into a prime (161716351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 249625 + ... + 250271.

It is an arithmetic number, because the mean of its divisors is an integer number (5837832).

Almost surely, 2^161716356 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 161716356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210161952).

161716356 is an abundant number, since it is smaller than the sum of its proper divisors (258607548).

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

161716356 is a wasteful number, since it uses less digits than its factorization.

161716356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841 (or 836 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 161716356 is about 12716.7745910667. The cubic root of 161716356 is about 544.8178343570.

The spelling of 161716356 in words is "one hundred sixty-one million, seven hundred sixteen thousand, three hundred fifty-six".