166530663617 has 2 divisors, whose sum is σ = 166530663618. Its totient is φ = 166530663616.

The previous prime is 166530663601. The next prime is 166530663641. The reversal of 166530663617 is 716366035661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165401636416 + 1129027201 = 406696^2 + 33601^2 .

It is a cyclic number.

It is not a de Polignac number, because 166530663617 - 2⁴ = 166530663601 is a prime.

It is not a weakly prime, because it can be changed into another prime (166530663667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83265331808 + 83265331809.

It is an arithmetic number, because the mean of its divisors is an integer number (83265331809).

Almost surely, 2^166530663617 is an apocalyptic number.

It is an amenable number.

166530663617 is a deficient number, since it is larger than the sum of its proper divisors (1).

166530663617 is an equidigital number, since it uses as much as digits as its factorization.

166530663617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 50.

The spelling of 166530663617 in words is "one hundred sixty-six billion, five hundred thirty million, six hundred sixty-three thousand, six hundred seventeen".