161916552 has 96 divisors (see below), whose sum is σ = 503268480. Its totient is φ = 46068480.

The previous prime is 161916533. The next prime is 161916553. The reversal of 161916552 is 255619161.

161916552 is a `hidden beast` number, since 16 + 1 + 91 + 6 + 552 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (161916553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156228 + ... + 157260.

It is an arithmetic number, because the mean of its divisors is an integer number (5242380).

Almost surely, 2^161916552 is an apocalyptic number.

161916552 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 161916552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251634240).

161916552 is an abundant number, since it is smaller than the sum of its proper divisors (341351928).

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

161916552 is a wasteful number, since it uses less digits than its factorization.

161916552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363 (or 1356 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 161916552 is about 12724.6434920590. The cubic root of 161916552 is about 545.0425598725.

The spelling of 161916552 in words is "one hundred sixty-one million, nine hundred sixteen thousand, five hundred fifty-two".