166800001 has 2 divisors, whose sum is σ = 166800002. Its totient is φ = 166800000.

The previous prime is 166799989. The next prime is 166800043. The reversal of 166800001 is 100008661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133171600 + 33628401 = 11540^2 + 5799^2 .

It is an emirp because it is prime and its reverse (100008661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166800001 - 2⁷ = 166799873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166800061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83400000 + 83400001.

It is an arithmetic number, because the mean of its divisors is an integer number (83400001).

Almost surely, 2^166800001 is an apocalyptic number.

It is an amenable number.

166800001 is a deficient number, since it is larger than the sum of its proper divisors (1).

166800001 is an equidigital number, since it uses as much as digits as its factorization.

166800001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 166800001 is about 12915.1074714847. The cubic root of 166800001 is about 550.4679224548.

Adding to 166800001 its reverse (100008661), we get a palindrome (266808662).

The spelling of 166800001 in words is "one hundred sixty-six million, eight hundred thousand, one".