8720011161 has 27 divisors (see below), whose sum is σ = 13387382463. Its totient is φ = 5468391360.

The previous prime is 8720011133. The next prime is 8720011187. The reversal of 8720011161 is 1611100278.

The square root of 8720011161 is 93381.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6788936025 + 1931075136 = 82395^2 + 43944^2 .

It is not a de Polignac number, because 8720011161 - 2⁷ = 8720011033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8720010161) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4761516 + ... + 4763346.

Almost surely, 2^8720011161 is an apocalyptic number.

8720011161 is the 93381-st square number.

8720011161 is the 46691-st centered octagonal number.

It is an amenable number.

8720011161 is a deficient number, since it is larger than the sum of its proper divisors (4667371302).

8720011161 is an equidigital number, since it uses as much as digits as its factorization.

8720011161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702 (or 1851 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The cubic root of 8720011161 is about 2058.2858112970.

The spelling of 8720011161 in words is "eight billion, seven hundred twenty million, eleven thousand, one hundred sixty-one".