161776056 has 128 divisors (see below), whose sum is σ = 452390400. Its totient is φ = 47900160.

The previous prime is 161776031. The next prime is 161776057. The reversal of 161776056 is 650677161.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161776057) 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 31 ways as a sum of consecutive naturals, for example, 1484130 + ... + 1484238.

It is an arithmetic number, because the mean of its divisors is an integer number (3534300).

Almost surely, 2^161776056 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 161776056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226195200).

161776056 is an abundant number, since it is smaller than the sum of its proper divisors (290614344).

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

161776056 is a wasteful number, since it uses less digits than its factorization.

161776056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 161776056 is about 12719.1216677882. The cubic root of 161776056 is about 544.8848686466.

The spelling of 161776056 in words is "one hundred sixty-one million, seven hundred seventy-six thousand, fifty-six".