166701001 has 2 divisors, whose sum is σ = 166701002. Its totient is φ = 166701000.

The previous prime is 166700977. The next prime is 166701013. The reversal of 166701001 is 100107661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122677776 + 44023225 = 11076^2 + 6635^2 .

It is a cyclic number.

It is not a de Polignac number, because 166701001 - 2⁵ = 166700969 is a prime.

It is not a weakly prime, because it can be changed into another prime (166701061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83350500 + 83350501.

It is an arithmetic number, because the mean of its divisors is an integer number (83350501).

Almost surely, 2^166701001 is an apocalyptic number.

It is an amenable number.

166701001 is a deficient number, since it is larger than the sum of its proper divisors (1).

166701001 is an equidigital number, since it uses as much as digits as its factorization.

166701001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 166701001 is about 12911.2741818924. The cubic root of 166701001 is about 550.3589953780.

Adding to 166701001 its reverse (100107661), we get a palindrome (266808662).

It can be divided in two parts, 16670 and 1001, that added together give a palindrome (17671).

The spelling of 166701001 in words is "one hundred sixty-six million, seven hundred one thousand, one".