161778882 has 32 divisors (see below), whose sum is σ = 342129600. Its totient is φ = 50856768.

The previous prime is 161778853. The next prime is 161778887. The reversal of 161778882 is 288877161.

161778882 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161778882² = 52344813322339848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161778887) 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 15 ways as a sum of consecutive naturals, for example, 23008 + ... + 29204.

It is an arithmetic number, because the mean of its divisors is an integer number (10691550).

Almost surely, 2^161778882 is an apocalyptic number.

161778882 is an abundant number, since it is smaller than the sum of its proper divisors (180350718).

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

161778882 is a wasteful number, since it uses less digits than its factorization.

161778882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6450.

The product of its digits is 301056, while the sum is 48.

The square root of 161778882 is about 12719.2327598798. The cubic root of 161778882 is about 544.8880414187. Note that the first 3 decimals are identical.

The spelling of 161778882 in words is "one hundred sixty-one million, seven hundred seventy-eight thousand, eight hundred eighty-two".