8161301820 has 144 divisors (see below), whose sum is σ = 26841604608. Its totient is φ = 1847260800.

The previous prime is 8161301801. The next prime is 8161301821. The reversal of 8161301820 is 281031618.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161301821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 289345 + ... + 316295.

It is an arithmetic number, because the mean of its divisors is an integer number (186400032).

Almost surely, 2^8161301820 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 8161301820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13420802304).

8161301820 is an abundant number, since it is smaller than the sum of its proper divisors (18680302788).

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

8161301820 is a wasteful number, since it uses less digits than its factorization.

8161301820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27080 (or 27071 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 8161301820 is about 90339.9237325337. The cubic root of 8161301820 is about 2013.3524756475.

The spelling of 8161301820 in words is "eight billion, one hundred sixty-one million, three hundred one thousand, eight hundred twenty".