166329809 has 2 divisors, whose sum is σ = 166329810. Its totient is φ = 166329808.

The previous prime is 166329803. The next prime is 166329833. The reversal of 166329809 is 908923661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147865600 + 18464209 = 12160^2 + 4297^2 .

It is an emirp because it is prime and its reverse (908923661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166329809 - 2²⁴ = 149552593 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166329809.

It is not a weakly prime, because it can be changed into another prime (166329803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83164904 + 83164905.

It is an arithmetic number, because the mean of its divisors is an integer number (83164905).

Almost surely, 2^166329809 is an apocalyptic number.

It is an amenable number.

166329809 is a deficient number, since it is larger than the sum of its proper divisors (1).

166329809 is an equidigital number, since it uses as much as digits as its factorization.

166329809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 166329809 is about 12896.8914471666. The cubic root of 166329809 is about 549.9501982455.

The spelling of 166329809 in words is "one hundred sixty-six million, three hundred twenty-nine thousand, eight hundred nine".