1836656161 has 2 divisors, whose sum is σ = 1836656162. Its totient is φ = 1836656160.

The previous prime is 1836656123. The next prime is 1836656203. The reversal of 1836656161 is 1616566381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1820302225 + 16353936 = 42665^2 + 4044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1836656161 - 2¹⁹ = 1836131873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1836659161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 918328080 + 918328081.

It is an arithmetic number, because the mean of its divisors is an integer number (918328081).

Almost surely, 2^1836656161 is an apocalyptic number.

It is an amenable number.

1836656161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1836656161 is an equidigital number, since it uses as much as digits as its factorization.

1836656161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 1836656161 is about 42856.2266304443. The cubic root of 1836656161 is about 1224.6423859076.

The spelling of 1836656161 in words is "one billion, eight hundred thirty-six million, six hundred fifty-six thousand, one hundred sixty-one".