166530641 has 2 divisors, whose sum is σ = 166530642. Its totient is φ = 166530640.

The previous prime is 166530631. The next prime is 166530653. The reversal of 166530641 is 146035661.

166530641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139334416 + 27196225 = 11804^2 + 5215^2 .

It is a cyclic number.

It is not a de Polignac number, because 166530641 - 2¹⁸ = 166268497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166530598 and 166530607.

It is not a weakly prime, because it can be changed into another prime (166530631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83265320 + 83265321.

It is an arithmetic number, because the mean of its divisors is an integer number (83265321).

Almost surely, 2^166530641 is an apocalyptic number.

It is an amenable number.

166530641 is a deficient number, since it is larger than the sum of its proper divisors (1).

166530641 is an equidigital number, since it uses as much as digits as its factorization.

166530641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 166530641 is about 12904.6751605765. The cubic root of 166530641 is about 550.1714517819.

The spelling of 166530641 in words is "one hundred sixty-six million, five hundred thirty thousand, six hundred forty-one".