166611155941 has 2 divisors, whose sum is σ = 166611155942. Its totient is φ = 166611155940.

The previous prime is 166611155939. The next prime is 166611155983. The reversal of 166611155941 is 149551116661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153989532225 + 12621623716 = 392415^2 + 112346^2 .

It is a cyclic number.

It is not a de Polignac number, because 166611155941 - 2¹ = 166611155939 is a prime.

Together with 166611155939, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 166611155891 and 166611155900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166611155441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83305577970 + 83305577971.

It is an arithmetic number, because the mean of its divisors is an integer number (83305577971).

Almost surely, 2^166611155941 is an apocalyptic number.

It is an amenable number.

166611155941 is a deficient number, since it is larger than the sum of its proper divisors (1).

166611155941 is an equidigital number, since it uses as much as digits as its factorization.

166611155941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 46.

The spelling of 166611155941 in words is "one hundred sixty-six billion, six hundred eleven million, one hundred fifty-five thousand, nine hundred forty-one".