166590805009 has 2 divisors, whose sum is σ = 166590805010. Its totient is φ = 166590805008.

The previous prime is 166590805001. The next prime is 166590805013. The reversal of 166590805009 is 900508095661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103750342609 + 62840462400 = 322103^2 + 250680^2 .

It is a cyclic number.

It is not a de Polignac number, because 166590805009 - 2³ = 166590805001 is a prime.

It is not a weakly prime, because it can be changed into another prime (166590805001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83295402504 + 83295402505.

It is an arithmetic number, because the mean of its divisors is an integer number (83295402505).

Almost surely, 2^166590805009 is an apocalyptic number.

It is an amenable number.

166590805009 is a deficient number, since it is larger than the sum of its proper divisors (1).

166590805009 is an equidigital number, since it uses as much as digits as its factorization.

166590805009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 166590805009 in words is "one hundred sixty-six billion, five hundred ninety million, eight hundred five thousand, nine".