8161564322 has 18 divisors (see below), whose sum is σ = 12364082523. Its totient is φ = 4040601012.

The previous prime is 8161564319. The next prime is 8161564363. The reversal of 8161564322 is 2234651618.

It can be written as a sum of positive squares in only one way, i.e., 4080782161 + 4080782161 = 63881^2 + 63881^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=63881.

It is a super-2 number, since 2×8161564322² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 16225523 + ... + 16226025.

Almost surely, 2^8161564322 is an apocalyptic number.

8161564322 is a deficient number, since it is larger than the sum of its proper divisors (4202518201).

8161564322 is an frugal number, since it uses more digits than its factorization.

8161564322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262 (or 632 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 8161564322 is about 90341.3765779557. The cubic root of 8161564322 is about 2013.3740613944.

The spelling of 8161564322 in words is "eight billion, one hundred sixty-one million, five hundred sixty-four thousand, three hundred twenty-two".