166232609 has 2 divisors, whose sum is σ = 166232610. Its totient is φ = 166232608.

The previous prime is 166232603. The next prime is 166232623. The reversal of 166232609 is 906232661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147501025 + 18731584 = 12145^2 + 4328^2 .

It is an emirp because it is prime and its reverse (906232661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166232609 - 2⁴ = 166232593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166232603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83116304 + 83116305.

It is an arithmetic number, because the mean of its divisors is an integer number (83116305).

Almost surely, 2^166232609 is an apocalyptic number.

It is an amenable number.

166232609 is a deficient number, since it is larger than the sum of its proper divisors (1).

166232609 is an equidigital number, since it uses as much as digits as its factorization.

166232609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 166232609 is about 12893.1225465362. The cubic root of 166232609 is about 549.8430505335.

The spelling of 166232609 in words is "one hundred sixty-six million, two hundred thirty-two thousand, six hundred nine".