8161438164 has 48 divisors (see below), whose sum is σ = 20809338816. Its totient is φ = 2469024000.

The previous prime is 8161438121. The next prime is 8161438189. The reversal of 8161438164 is 4618341618.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 27894 + ... + 130770.

It is an arithmetic number, because the mean of its divisors is an integer number (433527892).

Almost surely, 2^8161438164 is an apocalyptic number.

It is an amenable number.

8161438164 is an abundant number, since it is smaller than the sum of its proper divisors (12647900652).

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

8161438164 is a wasteful number, since it uses less digits than its factorization.

8161438164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103496 (or 103494 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 8161438164 is about 90340.6783459146. The cubic root of 8161438164 is about 2013.3636873801.

The spelling of 8161438164 in words is "eight billion, one hundred sixty-one million, four hundred thirty-eight thousand, one hundred sixty-four".