8160661 has 4 divisors (see below), whose sum is σ = 8166892. Its totient is φ = 8154432.

The previous prime is 8160637. The next prime is 8160673. The reversal of 8160661 is 1660618.

8160661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1660618 = 2 ⋅830309.

It can be written as a sum of positive squares in 2 ways, for example, as 4622500 + 3538161 = 2150^2 + 1881^2 .

It is a cyclic number.

It is not a de Polignac number, because 8160661 - 2⁹ = 8160149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8160601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306 + ... + 4051.

It is an arithmetic number, because the mean of its divisors is an integer number (2041723).

Almost surely, 2^8160661 is an apocalyptic number.

It is an amenable number.

8160661 is a deficient number, since it is larger than the sum of its proper divisors (6231).

8160661 is a wasteful number, since it uses less digits than its factorization.

8160661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6230.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 8160661 is about 2856.6870672161. The cubic root of 8160661 is about 201.3299778568.

The spelling of 8160661 in words is "eight million, one hundred sixty thousand, six hundred sixty-one".