166766008813 has 2 divisors, whose sum is σ = 166766008814. Its totient is φ = 166766008812.

The previous prime is 166766008709. The next prime is 166766008819. The reversal of 166766008813 is 318800667661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165520412964 + 1245595849 = 406842^2 + 35293^2 .

It is a cyclic number.

It is not a de Polignac number, because 166766008813 - 2²¹ = 166763911661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166766008819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83383004406 + 83383004407.

It is an arithmetic number, because the mean of its divisors is an integer number (83383004407).

Almost surely, 2^166766008813 is an apocalyptic number.

It is an amenable number.

166766008813 is a deficient number, since it is larger than the sum of its proper divisors (1).

166766008813 is an equidigital number, since it uses as much as digits as its factorization.

166766008813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 166766008813 in words is "one hundred sixty-six billion, seven hundred sixty-six million, eight thousand, eight hundred thirteen".