166402237 has 2 divisors, whose sum is σ = 166402238. Its totient is φ = 166402236.

The previous prime is 166402219. The next prime is 166402277. The reversal of 166402237 is 732204661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143496441 + 22905796 = 11979^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 166402237 - 2¹¹ = 166400189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166402199 and 166402208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166402277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83201118 + 83201119.

It is an arithmetic number, because the mean of its divisors is an integer number (83201119).

Almost surely, 2^166402237 is an apocalyptic number.

It is an amenable number.

166402237 is a deficient number, since it is larger than the sum of its proper divisors (1).

166402237 is an equidigital number, since it uses as much as digits as its factorization.

166402237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 166402237 is about 12899.6991050179. The cubic root of 166402237 is about 550.0300115855.

Adding to 166402237 its reverse (732204661), we get a palindrome (898606898).

The spelling of 166402237 in words is "one hundred sixty-six million, four hundred two thousand, two hundred thirty-seven".