18165606577 has 2 divisors, whose sum is σ = 18165606578. Its totient is φ = 18165606576.

The previous prime is 18165606533. The next prime is 18165606587. The reversal of 18165606577 is 77560656181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16265431296 + 1900175281 = 127536^2 + 43591^2 .

It is a cyclic number.

It is not a de Polignac number, because 18165606577 - 2¹⁹ = 18165082289 is a prime.

It is not a weakly prime, because it can be changed into another prime (18165606587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9082803288 + 9082803289.

It is an arithmetic number, because the mean of its divisors is an integer number (9082803289).

Almost surely, 2^18165606577 is an apocalyptic number.

It is an amenable number.

18165606577 is a deficient number, since it is larger than the sum of its proper divisors (1).

18165606577 is an equidigital number, since it uses as much as digits as its factorization.

18165606577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 18165606577 in words is "eighteen billion, one hundred sixty-five million, six hundred six thousand, five hundred seventy-seven".