181660020611 has 2 divisors, whose sum is σ = 181660020612. Its totient is φ = 181660020610.

The previous prime is 181660020599. The next prime is 181660020629. The reversal of 181660020611 is 116020066181.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181660020611 is a prime.

It is not a weakly prime, because it can be changed into another prime (181660020631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90830010305 + 90830010306.

It is an arithmetic number, because the mean of its divisors is an integer number (90830010306).

Almost surely, 2^181660020611 is an apocalyptic number.

181660020611 is a deficient number, since it is larger than the sum of its proper divisors (1).

181660020611 is an equidigital number, since it uses as much as digits as its factorization.

181660020611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

Adding to 181660020611 its reverse (116020066181), we get a palindrome (297680086792).

The spelling of 181660020611 in words is "one hundred eighty-one billion, six hundred sixty million, twenty thousand, six hundred eleven".